Any time a buyer opens a return stating that the item is damaged or defective, no matter whether they are being truthful or not, eBay requires you to either accept the return and refund their payment when you get the item back, or you can refund and let them keep the item.
If your buyer opened the case with Paypal, the buyer has to pay the return shipping.
Your buyer might not return the programmer. But if he does, you are stuck with the refund.
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Successful and experienced seller since 1997, over 70,000 feedback, boardie since the boards were begun.