IMPROVED COIN LOCK BOX as set forth in the following specification: Cross-Reference to Related Provisional Patent This application claims priority based on a provisional patent, specifically on the Provisional Patent Application Serial No. 60/548,522 filed February 27, 2004. Technical Field . The present invention is directed to coin lock boxes and, more particularly, to an improved coin lock box which includes a top plate having a key slot through which a immovably mounted key extends downwards, the top plate also including a coin pass- through opening, a coin lock box mounting structure mounted on the underside of the top plate and including mounting pin-receiving openings in the sides thereof, and a generally cylindrical coin lock box having a side wall, base wall, and top wall, the top wall including a rotatably mounted lock mechanism connected to a rotating plate mounted underneath the top wall of the lock box such that engagement by the key and rotation of the lock box opens the top or side opening in the top or side wall of the lock box and further causes the mounting pins mounted on the side wall of the coin lock box to engage the mounting pin-receiving openings of the coin lock box mounting structure to releasably secure the coin lock box underneath the top plate. Background Art The newspaper industry uses many different types of newspaper vending machines for distribution of newspapers. These include honor boxes, standard vending machines having a door which is opened to access the newspapers once coins are placed within the machine and single vend newspaper machines. Generally speaking, however, each of these devices have one thing in common and that is that the coin box into which coins are deposited is accessible by the newspaper route delivery driver for removal of the coins in the locked box. The advantage to this situation is that the delivery driver may easily remove the accumulated monies from the coin box and take them back to the newspaper distribution center, therefore eliminating the need for a separate money collection person. The disadvantage, however, is that a dishonest delivery route driver may steal the accumulated monies or report a smaller amount of collected money, thus depriving the newspaper company of its rightfully received income. To a great extent, newspaper companies account and allow for some degree of theft by their delivery drivers and think of it as merely the cost of doing business. However, it would be much preferable to eliminated this theft, and therefore there is a substantial need for an easy-to-use coin lock box mechanism which can be fitted into the various types of newspaper vending machines and which may be quickly and easily removed and replaced by the delivery driver while preventing access to the coins deposited therein. Therefore, an object of the present invention is to provide an improved coin lock box. Another object of the present invention is to provide an improved coin lock box in which the access key is retained within the coin lock box support and is not carried by the coin removal attendant, thus preventing loss and/ortheft of the key which permits access to the interior of the coin lock box mechanism. Another object of the present invention is to provide an improved coin lock box: which may be quickly and easily removed and replaced within a vending machine to enhance the efficiency of use of the present invention. Another object of the present invention is to provide an improved coin lock box: which includes a coin lock box mounting structure having a stationary key mounted therein and a portable coin lock box which may be inserted into the coin lock box: mounting structure so that the key engages a locking mechanism within the coin lock box to permit coins to fall within the coin lock box and be retained therein. Another object of the present invention is to provide an improved coin lock box: in which the coin slot is positioned on the top and/or side of the coin lock box to permit the unit to be used with a variety of vending devices. Finally, an object of the present invention is to provide an improved coin lock boxc which is relatively simple and durable in construction and is safe, secure, and efficient in use. Disclosure of Invention A coin lock box includes a coin lock box mounting section including a coin lock box retention structure, a coin slot formed in the coin lock box mounting section operative to permit objects to objects to enter and exit the coin lock box mounting section and a key mounted thereon and a coin lock box including an outer circumferential wall structure, a top wall mounted on the outer circumferential wall structure, a base wall mounted on the outer circumferential wall structure, a coin slot formed in one of the top wall and the outer circumferential wall structure and a coin lock box access mechanism operative to alternatively permit and restrict access to the interior of the coin lock box. The coin lock box access mechanism further includes a lock box access plate movably mounted within the coin lock box and an access plate coin slot formed in and extending through the lock box access plate, the lock box access plate movable between an aligned position where the access plate coin slot is generally aligned with the coin slot of the coin lock box thereby allowing objects to enter and exit the coin lock box and an offset position where the access plate coin slot is generally offset from the coin slot of the coin lock box thereby restricting objects from entering and exiting the coin lock box. A lock device is mounted on the coin lock box, the lock means operatively connected to the lock box access plate of the coin lock box access mechanism such that operation of the lock device moves the lock box access plate between the aligned position and the offset position. Finally, the key engages and operates the lock device upon the coin lock box being inserted and secured within the coin lock box mounting section to move the lock box access plate from the offset position to the aligned position. As thus described, the coin lock box of the present invention provides numerous advantages over those coin reception devices found in the prior art. For example, because the key used in connection with the locking box of the present invention is kept within the vending machine at all times, it is virtually impossible for the collector of the coins to be unable to remove the coins due to loss or theft of the key. Furthermore, this feature also makes it far more unlikely that an unscrupulous individual would be able to copy the key to allow access to the contents of the coin lock box as the key is inaccessible for such a purpose. Also, because the coin lock box is quickly and easily removable from the vending machine in which it is mounted, removal and replacement of the coin lock box from the vending machine is made far more efficient than the level of efficiency permitted by those devices found in the prior art. Finally, because the positioning of the coin opening in the lock box and lock box support may be modified or changed while retaining the functionality of the coin lock box device of the present invention, the present invention may be used with a great variety of vending machines currently being produced, thus permitting retrofit installation of the improved coin lock box of the present invention. The present invention thus provides numerous advantages over those devices found in the prior art. Brief Description of the Drawings Figure 1 is a perspective view of the coin lock box of the present invention showing a coin being inserted therein; Figure 2 is a perspective view of the present invention showing the coin lock box and the coin lock box mounting section of the present invention; Figure 3 is a detailed perspective view of the coin lock box mounting structure of the present invention showing the preferred generally rectangular shape of the mounting structure; Figure 4 is an exploded detailed perspective view of the coin lock box section of the present invention; Figure 5 is a detailed side elevational view of the present invention showing the coin lock box being inserted into the coin lock box mounting structure; , Figure 6 is a detailed side elevational view of the present invention showing the coin lock box inserted into and mounted within the coin lock box mounting structure; Figure 7 is a perspective view of an alternative embodiment of the coin lock box of the present invention; Figure 8 is a detailed perspective view of the alternative embodiment of the coin lock box showing the modified elements thereof; Figure 9 is an exploded detailed perspective view of the alternative embodiment of the coin lock box of the present invention; and Figure 10 is a detailed side elevational view of the alternative embodiment of the coin lock box. Mode(s) For Carrying Out The Invention The coin lock box mechanism 10 of the present invention is best shown in Figures 1 and 2 as including two main sections, a coin lock box mounting section 12 and the coin lock box 50 itself which is removably and releasably mounted within the coin lock box mounting section 12, both of which are preferably constructed of metal such as steel or stainless steel to ensure longevity and strength. In the preferred embodiment, the coin lock box mounting section 12 would include a top plate 14 having a generally rectangular coin slot 16 formed therein, as shown best in Figures 2 and 3, and would further include a key slot 18 formed at approximately the midpoint of top plate 14. Although the key slot 18 may be of other shapes than generally rectangular, as shown in Figures 2 and 3, it is reasonably important that key slot 18 have a size and shape approximately equal or slightly larger than the dimensions of the key 20 which will extend into and downwards through key slot 18 to ensure that unauthorized access to the key is generally prevented. In the preferred embodiment, the key 20 would be of a standard key size and shape and would extend downwards through key slot 18, as shown best in Figures 1, 2, 3, and 5. The key 20 would then be secured within key slot 18 by a bolt and nut combination 22 with the bolt passing through the center hole of key 20 and into and through hole 24 formed in key mount plate 26 which is mounted on and extends upwards from top plate 14. The exact size and shape of key mount plate 26 is not critical to the present invention so long as the key 20 is properly supported within key slot 18 with the shank of the key 20 extending downwards through the key slot 18. Once the bolt and nut combination 22 has affixed key 20 to key mount plate 26, the key 20 is securely mounted on key mount plate 26 in a stationary position and cannot be removed without removing bolt and nut combination 22, which is inaccessible to unauthorized persons when mounted within the newspaper vending machine. It is an important element of the present invention that the key 20 be stationary and extend downwards through top plate 14 to engage the coin lock box 50 as will be related later in this disclosure. Extending downwards from and mounted to the underside of top plate 14 is a coin lock box mounting structure 30 which, in the preferred embodiment, would include outer walls 32 having at least two mounting pin-receiving slots 34 formed therein. It should be further noted that although the outer walls 32 are shown as generally cylindrical in shape in Figures 1 and 2 and as generally rectangular in Figure 3, the exact size and shape of the outer walls 32 is not critical to the present invention so long as they perform the function of retaining the coin lock box 50 within the outer walls 32 through the mounting pin-receiving slots 34 or another such mounting system. Therefore, as shown in Figure 3, the outer walls 32 may be generally rectangular in shape or assume any other appropriate shape as is necessary to fit within the confines of the newspaper vending machine in which the coin lock box mechanism 10 of the present invention is to be mounted. It should also be noted that the mounting pin- receiving slots 34 guide the coin lock box 50 into the coin lock box mounting section 12, thus facilitating removal and replacement of the coin lock box 50 even in situations where visual confirmation of the positioning of the coin lock box 50 relative to the coin lock box mounting section 12 is not available. The coin lock box 50 is best shown in Figures 2 and 4-6 as including generally cylindrical outer wall 52, a base wall 54 mounted on the underside of outer wall 52, and a coin lock box access mechanism 60 which would preferably include the following elements. Stationary top disk 62 would be mounted on the top of outer wall 52 and would completely cover and enclose the outer wall 52, except for coin opening 64 and center lock support hole 66, as shown best in Figure 4. Mounted on and extending through the center lock support hole 66 of stationary top plate 62 is lock mechanism 70 which, in the preferred embodiment, would be a standard key-operated locking mechanism which includes an outer stationary sleeve 72 and an inner rotating element 74 operatively connected to the lock mechanism such that when the key 20 is placed within the lock mechanism 70, the inner rotating element 74 is rotatable relative to outer sleeve 72. Mounted on inner rotating element 74 of lock mechanism 70 is lock box access plate 80 which is secured to inner rotating element 74 of lock mechanism 70 by a washer 82, inner locking nut 84, a plate support arm 86 which helps to securely mount t lock box access plate 80 on inner rotating element 74 of lock mechanism 70 and prevent deformation of the lock box access plate 80 to access the interior of the coin lock box 50, and an outer locking nut 88, as shown best in Figure 4. Lock box access plate 80 would also include a coin opening 81 formed adjacent the outer edge of lock box access plate 80 which would be of generally the same shape and size as coin opening 64 in stationary top plate 62. The operation of coin lock box access mechanism 60 is shown best in Figures 5 and 6 as the coin lock box 50 is moved upwards within coin lock box mounting section 12 with the mounting pins 56a and 56b on outer wall 52 fitting within the mounting pin- receiving slots 34 of coin lock box mounting structure 30. As the coin lock box 50 is moved upwards, the key 20 is inserted into lock mechanism 70, thus engaging the lock mechanism 70 and permitting rotation of coin lock box 50 relative to coin lock box mounting structure 30 as the mounting pins 56a and 56b slide within mounting pin- receiving slots 34. As the coin lock box 50 is rotated relative to the coin lock box mounting structure 30, the lock box access plate 80 is rotated along with inner rotating element 74 of lock mechanism 70 while the stationary top plate 62 remains stationary relative to the coin lock box 50. In fact, if the mechanism were viewed from above, the coin opening 81 of lock box access plate 80 is initially aligned with the coin slot 16 of top plate 14 and, as the coin lock box 50 is rotated relative to top plate 14 and coin lock box mounting structure 30, the coin opening 64 in stationary top plate 62 of coin lock box access mechanism 60 is rotated into alignment with the coin slot 16 of top plate 14 and coin opening 81 of lock box access plate 80. Money then dropped into the coin slot 16 of top plate 14 passes completely through the top plate 14, stationary top plate 62, and lock box access plate 80 and into the coin lock box 50. When the coin lock box 50 is to be removed from the coin lock box mounting section 12, the coin lock box 50 is rotated in the opposite direction from what was described during installation. The coin opening 81 of lock box access plate 80 and coin opening 64 of stationary top plate 62 thus become offset and not aligned and this prevents access to the interior of coin lock box 50 and therefore access to monies deposited within the coin lock box 50. The coin lock box 50 could then be returned to the newspaper company where a supervisor would open the coin lock box and remove the coins within the coin lock box 50, thus rendering it ready for use when replaced within the coin lock box mounting section 12. An alternative embodiment of the coin lock box mechanism 10' of the present invention is shown best in Figures 7-10 as including virtually all of the same features as the coin lock box mechanism 10 described in connection with Figures 1-6, including the coin lock box mounting section 12', top plate 14', coin opening 16" formed on the side of the coin lock box mounting section 12' instead of the top plate 14' thereof, key 20', key mount plate 26', the coin lock box mounting structure 30' including the outer walls 32' and the mounting pin-receiving slots 34". The alternative embodiment also includes each of the elements of the coin lock box 50' including generally cylindrical outer wall 52', base wall 54', coin lock box access mechanism 60* having stationary top disk 62', center lock support hole 66', lock mechanism 70 having outer stationary sleeve 72' and inner rotating element 74' and lock box access plate 80' which is secured to inner rotating element 74' of lock mechanism 70'. The alternative embodiment of the coin lock box mechanism 10' as thus described is very similar in function to the embodiment described in connection with Figures 1-6 but includes one significant modification to permit the coin lock box mechanism 10' to be used with a different type of vending device. Specifically, the coin lock box access mechanism 60' would further include a lock box access cylinder 92 which is mounted on and extended downwards from the lock box access plate 80', as shown best in Figures 8-10. The lock box access plate 80" would not include a coin opening 81 , as shown in Figure 4, as the lock box access cylinder 92 would include the coin opening 94 which is formed on the side of the lock box access cylinder 92 to permit coins to pass through the lock box access cylinder 92 into the interior of the coin lock box 50". Likewise, the coin opening 64 in stationary top plate 62 described previously in connection with the embodiments of Figures 1-6 would be moved to the outer wall 52' of the coin lock box 50' where coins may enter into the coin lock box 50' through outer wall 52' through the coin opening 96 in the outer wall 52'. In operation, the coin lock box 50' would function virtually identically to the coin lock box 50 described in connection with Figures 1-6, with the only significant difference being that the rotation of the lock box access plate 80" results in rotation of lock box access cylinder 92 which would bring the coin opening 94 into alignment with coin opening 96 in outer wall 52' of coin lock box 50', thus allowing coins to enter into the coin lock box 50" through the aligned coin openings 94 and 96, as shown best in Figures 7-10. It should be noted that by applying similar modifications to the structural elements of the coin lock box mechanism 10 and coin lock box mechanism 10" of the present invention, virtually any type of vending machine may be retrofitted to accommodate the coin lock box mechanism 10 and 10' of the present invention, merely by aligning the coin openings in the appropriate location as determined by the specific vending machine to which the coin lock box mechanism 10 and 10' is being added. Finally, it should be noted that the modifications disclosed in Figures 7-10 would eliminate the need for the coin slot 16 found in top plate 14, and such modifications would be understood by one skilled in the art of modifying such devices. As thus described, the coin lock box mechanism 10 of the present invention will generally prevent unauthorized access to the monies received for newspapers and thus prevent theft of the received monies. However, to generally eliminate the opportunity for theft from the coin lock box mechanism 10, it is contemplated to alternatively include a coin lock box locking plate 40 hingedly mounted on the underside of the coin lock box mounting section 12 as shown best in Figure 3. The hinged coin lock box locking plate 40 would preferably include a slot 42 into which fits a depending lock plate 44 through which a padlock 46 or the like may be removably inserted. The coin lock box locking plate 40 thus is used to prevent unauthorized removal of the coin lock box 50 from the coin lock box mounting section 12, thus preventing theft of the coin lock box 50. Of course, other theft prevention devices may be used with the present invention, but it has been found that the coin lock box locking plate 40 as thus described performs the theft prevention function desired very well. An additional beneficial feature of the present invention is the fact that the key remains within the coin lock box mounting section 12 at all times which ensures thatthe key cannot be lost or taken for duplication by the driver or any other person having access to the newspaper vending machine and this in turn ensures that monies will not be stolen from the coin lock box mechanism 10 of the present invention. Finally, because insertion and removal of the coin lock box 50 from coin lock box mounting section 12 may be quickly and easily performed, the route driver will not be inconvenienced by use of the present invention. It is to be understood that numerous additions, modifications, and substitutions may be made to the coin lock box mechanism 10 of the present invention which fall within the intended broad scope of the appended claims. For example, although the present invention has been described for use with newspaper vending machines, it may be used with virtually any type of vending machine into which money is deposited, and such minor modifications would be understood by those skilled in the art of vending machines. Also, the precise sizes, shapes, and construction materials used in connection with the coin lock box mechanism 10 of the present invention are not critical and may be modified or changed so long as the intended functionality of the coin lock box mechanism 10 is neither degraded nor destroyed. Finally, the precise and specific mounting pin and mounting pin-receiving slot arrangement may be modified or changed depending on the size and shape of the coin lock box and coin lock box mounting structure, and in fact may be replaced entirely with a different system for securely and releasably mounting the coin lock box 50 within the coin lock box mounting section 12. There has therefore been shown and described a coin lock box mechanism 10 which accomplishes at least ail of its intended objectives.