I. Sealed Key Envelope
The tamper-proof locking key envelope is the heart of the dual control system. After a lock has been serviced the keys are placed in a marked AdvanceTec locking envelope. Upon a new rental, your customer must sign the envelope and break the seal. This envelope demonstrates the fact that the keys and the lock have not been handled or tampered with by any of your financial center employees.

III. Sealed Key Storage Cabinet
(large cabinet available only in Texas)
This cabinet contains all the Tec sealed key envelopes to your available boxes. The envelopes are filed numerically. The top drawer is for the key return envelopes. When a box is surrendered the customer signed and places the keys in a special key return envelope. The envelope is then deposited through the slot on the key return drawer. A the appropriate time, an AdvanceTec Service Technician will remove the returned keys, rotate/service the lock, place the keys in a new sealed envelope and update the control card.