The Post Office can rekey the mailbox if the mailbox is owned by
the Post Office. All you have to do is call your local Post Office
and ask them to rekey. There is a charge, however, of around $50 to
do this.
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The lock must be disassembled and the tumblers inside either
rearranged or replaced to fit anew key.
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A lock smith should be able to.
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If it's the kind that CAN be re-keyed, then you just remove the
pin and the thing slides out.