1. A method for accessing an interior of a secure container comprising the steps of: calculating a plurality of codes to open the secure container on a stationary or mobile content-specific basis, wherein a plurality of calculated check digits are summed successively in modulo-n arithmetic followed by an Exclusive OR (XOR) logic operation, where the XOR logic operation outputs a sum modulo-n based on inputs, and wherein a remainder modulo-n generates a location-specific code increment/decrement offset; receiving one of the an opening codes into a code receiving device associated with a locking mechanism of the container; comparing the opening code with a box code stored in the locking mechanism to determine if a match occurs; if a match occurs, releasing the locking mechanism to allow opening of a lid for the secure container and, thereby, access to the interior.