Help advice needed: fraudulent return, do I accept?

Sold a pair of trainers on eBay to a buyer with 0 feedback and an account made in February (in hindsight I should have cancelled, but didn’t want to risk negative feedback at the time). Shoes arrived today and he’s instantly opened a return saying there’s red marks on the shoes, which is definitely not the case. The shoes were brand new, doubled boxed and protected with bubble wrap and properly sealed. I recorded the whole packing process and so have proof of their original condition, the buyer has obviously used ai or some sort of app to edit the marks on.

I called eBay and they told me to accept the return and contact them if there’s an issue when it comes back, but I’ve seen this scam before where people send back empty boxes or different shoes. Just wondering what’s the best way to protect myself here? Anyone dealt with this and actually won with eBay?

Any advice would greatly appreciate! I don’t fancy losing £170 :(