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There is a mail drop
slot upstairs into a collection box if you want to mail a letter. ... Access to the huge interior space of the World's Largest Mailbox ...
Plugsharge Locking Door Drop Box with Combination Lock – Steel Mailbox with Rear Access,
Mail Slot for Rent, Deposit, Night Key, and Mail – Through-Door Design Prevents Money Fishing, Durable Black.
Additionally, it has collection boxes, parcel drop boxes, mail
slots, and postal or private centralized mail delivery systems.