If I sell a package of memorabilia to a buyer, all of them I previously bought and owned for a long time, believed all to be authentic. I provided detailed photos and description. Now the buyer is telling me one of the items was not authentic and he wants a large portion of his money back for the one specific item. Even though I believe the overall value of the items is more than he paid me, even if the one items is not authentic is more than what he paid me, I am offering his some money back but he wants a pile or else he is going to paypal. Not sure what to think or do here. Any advice.
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