So long as you get off a few before they do, you're fine. People do all kinds of sneaky things to avoid other trademark problems.
I know one major item sold pretty often was razor blades, also usually stolen.
Perhaps they've tightened up some since a couple years ago. Or maybe the thieves have moved to more rinky-dink sites. But I don't think they'd bother stealing in these amounts if they couldn't get rid of the stuff somehow. Maybe some are kleptos who just can't control themselves, but at least some of these people are doing it for profit.