eBay buyer returns a different item to what they bought.

More normal eBay user behaviour, buy a item and send back some other crap.

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Long story short I sell motherboards and various computer parts, In my pictures you can clearly see the factory applied serial number labels and basically they returned a different motherboard than what I sent them. I uploaded pics of the different serials but eBay just closed the case in the buyers favor, no big surprise, but what is the best way I go about fighting this?

Source : redd.it/6dz1qe