It's funny but I also got scammed on eBay when I sold a headunit on there. The guy tried to claim that the unit had a service code and wanted $200 partial refund for repair. His mistake was using a stock photo from the internet which I found and made my case with PayPal. PayPal requested that he sends back the unit but he folded and didn't follow through only to later apologize saying it was his cousin that was "messing" around on his account. Idiots.
I highly recommend anyone who sells anything valuable use security tamper seal stickers on so people can't swap guts.
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Clarion NX807, Audison Bit One HD, Audison Voce 5.1k HD, Audison Voce Quattro HD, Focal Utopia M 3-way (TBM, 3.5WM, 6WM), Dynaudio Esotar 1200