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What @sbbohr said basically. I would suggest getting ebay to give you a call back and explain your situation. It isn't as one sided as people make it out to be but this is only the case is you are clear from your descriptions and photos. Speaking to a human has usually helped clear any issues I have had. From reinstating £1 listing fees on an item when a buyer pulls out or when stuff I've ordered is clearly not as described and the seller is being a C*nt
You dont know if he is trying it on or stupid. It actually doesnt matter. I just accept returns with profuse apologies.
The key thing is ultimately ebay will support his return however stupid the reason so you are now into damage limitation and avoiding adverse feedback.
Its annoying, and I hate sucking it up, but ebay is structured in favour of the buyer now, and thats the occasional drawback of selling through a site with bigger reach than any other site.