Our master control key for night deposit bags is kept in a double-custody key cabinet. Bags for safekeeping are only by special agreement, and are placed unopened in our cash vault as soon as they are removed from the ND vault. The customer usually brings their key to open the bag, and must sign for receipt of it.
Unfortuantely, keys to the key cabinet are not issued to the tellers, so two operations staff must accompany them to open the other ND bags. I like the idea of the safety seal bags!
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Let's start at the very beginning; A very good place to start...