in a not as described case, must the buyer provide any proof?

[mycv8z]

 on one of our accounts, buyer has made not as described  claim. Buyer will  not communicate, has not sent any supporting evidence. We have a top rated status . We know the claim to be utterly false, and just based on changed of mind at best or punishment for not allowing pickup. My question is.. without sending supporting proof of claim pics etc will ebay still grant in buyers favour?

Not sure who is more fraudulent.. the buyer making a spurious claim, or ebay for not  providing some measure of seller protection. Not helpful that I can get the item back then  take my own civil proceedings. I appreciate that the easiest thing to do is  send a refund, but that makes me equally as complicit in the fraud does it not? 

Remind me why we spend so long going over our things, honestly descibing  and checking them before we sell them .