One little tip on eBay, disclose everything about the product you're selling, so there'll be no recourse for them to seek a refund. So, do take photo's of those scratches.
Also, state clearly and boldly in the body of your text. Not Refundable.
One caveat this in no way encroaches their consumer rights, for example if the product is faulty but you state it works fine (hypothetically speaking, not stating this as a fact 🙂), they do have the right for a full refund despite your disclaimer.
Don't let that put you off. Somebody messed with me when I sold my Dali Zensor 1 speaker. The buyer claimed the tweeter was damaged in the transit but I suspect he wanted my good tweeter for his broken tweeter.
How I knew, well Dali's woofers are like finger prints, mine had a long line, appearing like a scratch. So when I had them back it wasn't there!
Always good to take photo of the serial number. 🙂