The dealer has to take the responsibility. These are inherent risks that a dealer must assume when he sells an item on the open market. Especially when they guarantee the authenticity of an item. The TPA's do not even guarantee the item, it is only their opinion. So when a dealer actually gives his own guarantee, he is assuming the risk of possible return later. Even if the same TPA that has already authenticated the item, later decides to fail it.
Maybe if the dealer sold the item "as is" but still with proper TPA he would not have to worry about return. But on the other hand, obviously buyers do not feel as comfortable buying items "as is" and typically are not willing to pay as much.
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