Back story: Brother bought if from SSense Mtl on sale for me, size too big so I decided to sell it. The seller received it after over a month (ground shipping cuz expensive af) and immediately opened up a paypal claim after saying he found 3 yellow stains that he didn't even show and saying it was fake. He insisted on getting my facebook to send screenshots of a facebook group post where someone told him it's fake but I decided to keep everything on grailed. Now, he tells me he contacted SSense who wanted the receipt, but we don't keep those papers unless they might be needed on the long-term(I already sold other items on Grailed and never had any problem) so I could not foresee this, and, if not, to rely on paypal for a refund. Is this guy trying to scam me?