So far, all the seller is responsible. Amazing change from this same sort of question fifteen years ago! If I had the time I would find it so you could see the opposite attitude back them, when the money changed hand without recourse way more often. PayPal has changed the game.(And I think rightly so, even back then I argued it was the seller's responsibility and onus, and got numerous attacks for even saying it out loud. Today, as mentioned, some folks want cash only, no PayPal, probably for this very reason. They want no responsibility for shipping problems. And if you go back and read early PayPal problems, (aside from fraud) most were about the seller angry for 'getting cheated;' because the item was damaged in shipping and PayPal sided with the buyer, thus the account blocked..