OP, I feel you, but you need to take good photos of everything if you're selling on eBay. I saw a similar issue in /r/retrogaming or the Saturn sub: Panzer Dragoon Saga was clearly swapped out for a more beat up copy and returned. That's pretty scummy.
On the flip side since COVID-19 hit I've had to return more items in three months than I have in three years. People are hard up for money and, my Lord, have sellers been extremely deceptive about listings.