How does one map cluster mailboxes? letter_box is likely, but then would it be private access? If only there was a separate cluster_mailbox node. : r/openstreetmap
Mailboxes and Secure Storage Systems | ABC Security Access Systems
Canada Post shuns Canadian companies for U.S. mailbox manufacturer | Toronto Sun
How does the mailman open a locked mailbox? - Quora
Mailboxes - New And Replace - FHSecurity.ca
The mailbox wasn't there': Woman says Canada Post moved community mailbox without notice | CBC News