Corrected entry: Unless it's a different style, the Gremlin in the mailbox could not have thrown letters back out or pulled a human arm into the box. The front flap pulls up another piece of metal that prevents theft of mail from the box.
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Correction: Gremlins are also small enough to fit into the mailbox bodily, then sabotage that flap (we know they like breaking things), then climb out and party as described.
dizzyd