I recently filed a claim with
ebay on a seller who sent me three counterfeit Japanese
Trade dollar coins. He continuously insisted that even though they weighed 19 grams instead of 27 grams that the difference was wear- they were XF instead of BU and that took off almost 1/3 of the weight.
ebay decided in my favor, and had Paypal refund my money even though I vehemently said that I would NOT return the coins, as the seller would just turn around and resell them to someone else as legitimate coins.