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What you can do is get an ebay user who's never bought any pins before (I'd be willing to do this) to email him about a particular item and say "I love this pin, do you have any more like it?" to see what he replies. If the guy says he has like 30 of the same NM pin, then it's really fishy and he's either making them himself or stealing them from whereever it is they're made.
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