Hi @hennesda,
I'm sorry to hear you haven't received your book back and the buyer isn't responding to your request to return the book.
We always recommend requesting the item is returned before issuing a refund or shipping a new item. As the buyer filed a claim with eBay, you'd have to work with eBay to see what options you have. I understand that you've already contacted eBay about the issue, I recommend contacting again asking if they have an appeal process. We do not have a process for a merchant to file a claim against a buyer.You can always try sending the buyer a money request or an invoice to pay for the item.
I hope you're able to work this out with the buyer.
I hope this information helps!
Thanks,
PayPal_Tricia
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