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You haven't read the PayPal Seller Protection terms.
Sellers are typically not protected against Significantly Not As Described claims unless in the claim, the buyer showed some kind of buyer's remorse (see below). PayPal was not there when you sold it and not there when the buyer received it. They can only undo the transaction with a return and refund. Lucky PayPal didn't ask you to pay for a return label because they can with the newly update policies.
Get the item back and re-test it. And if the buyer lost the PayPal claim, they can do a 'not as described' chargeback through their credit card (which PayPal also doesn't cover you for) which will be more costly and could take longer to resolve and it is more likely the card issuer bank will rule in favor of the buyer and no chance of you getting your item back.
Significantly Not as Described claims
An item may be considered Significantly Not as Described if:
An item may not be considered Significantly Not as Described if: