One of the big stories going around the internet is the one about the eBay customer who may or may not have smashed a valuable antique violin. Apparently this is Paypal policy. If you want to get your money back, you have to smash the item.
Claims "Erica," the seller: "The buyer was proud of himself, so he sent me a photo of the destroyed violin."
an antique violin dealer and former auctioneer at Sotheby's, said that
"only an imbecile" would buy a precious instrument without playing it
first. Which would kind of leave eBay out, I would think.
My own opinion would be that if it requires an expert to authenticate it, it should similarly require an expert to unauthenticate it. Advice: neither buy nor sell your Guarneri on eBay.