LostinDakota typed... ". It really helps to have the key all ready to put into the customer's box without having to retrieve the key from the lock, especially on days with bad weather or wind.
Here is rule for CBUS...
Centralized Installations
No bad weather if you hold their feet to the fire.
Neighborhood Delivery Center is a freestanding, sheltered or enclosed installation containing a large number of individually locked, wall-mounted mailboxes.
JS.... Those with CBUS that are serviced with a dismount around here in Snow globe world have a roof covering.