As a new homeowner in Elk Grove, California, you may find these shared USPS mailboxes on the curb to receive your mails. The problem exists when you did not receive a key from the prior homeowner, or you would want to be sure that everything is more secure by having a new key barrel and lock. The USPS office I went to is the Bruceville Rd USPS branch. They open at 9am (Maps say 9:30 AM, but that info is outdated since covid pandemic ended). They WILL NOT entertain any request for shared mailboxes keys here! The correct place to go is the USPS Pick Up or service location with the address 8215 Longleaf Dr, Elk Grove, CA 95758. The place opens at 10am (as of August 1, 2023). The entry point for customers or clients is located at the corner of the building, where there is the sign "Customer Pick Up". Please bring your Driver ID and mortgage or home ownership documents for verification. Any questions? Feel free to drop an email!.