The seller clearly knows what he has so it isn't a case of ignorance. If they weren't stolen, he could just sell them to GameStop and get a lot more money back. But then he would have to provide his personal information which could lead back to him. I would hope for your sake that the ones you resold on eBay don't end up biting you in the ass because you will have a hard time proving that someone else stole them.
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Maybe, just once, someone will call me "sir" without adding, "you're making a scene."