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They're federal agents within the Postal Service.

Legally, you can't mail any "obscene, lewd, lascivious, indecent, filthy or vile article, matter, thing, device, or substance"

Interesting. How do porn magazines, fleshlights, etc ship?

Inside a brown paper package or envelope, unlike a postcard.

So the inspectors can only look at the packaging, not touch them?