Usps lock change fee. Customers also are charged fees for duplicate and replacement post office box keys and for initiating lock changes on post office boxes. Learn about USPS mailbox locks, keys, and guidelines for secure mail delivery and maintenance. 00,180. USPS-Approved Mailboxes The USPS publishes a list of approved centralized mailboxes each year. USPS. Customers can exchange, at no charge, up to two keys with each "new" lock. 00,134. 00,, C36,83. ×Sorry to interruptCSS Error 3-2 Mailbox Locks and Keys The Postal Service prohibits carriers from accepting keys for locks on private mail receptacles, buildings, or offices, except where an electromechanical door lock system or key keeper box is used. 00,148. 0zoardaz xho9nk k8ow yrsby o7r qc3 ksqt 25pex vpe33w y8oo