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IIRC the movie Space Camp (80s?) features a mail-robot, perhaps the kid hides in it?

Ah, thanks, I didn't think it was quite right.

There's one in the show The Americans, as well.

With the Soviets putting a recording device into the one driving through the FBI's office.

Such an odd thing that it might as well have happened, sadly I never managed to find any real history behind it.