Sold My Grandfather's Watch On Ebay For $1,200, Buyer Returned A Fake And Ebay Gave Them A Full Refund

Location: Tampa, FL

So I listed my grandfather's Seiko Presage on eBay about 6 weeks ago. Sold it for $1,200 to a buyer with decent feedback. I took like 30+ photos of every angle, the serial number, the caseback, everything before shipping. Packed it in the original box with bubble wrap, sent it tracked and insured through USPS.

Buyer receives it then 8 days later opens a return request saying it was "not authentic." I was confused because its literally a Seiko not even a high end luxury brand people typically fake. Anyway eBay automatically approved the return before I could even respond properly.

Package comes back and it is not my watch. Different serial number, the caseback looks nothing like mine, the crown is on the wrong side. Guy literally sent back a broken knockoff. I have photo proof comparing both and the serials dont match at all.

I called eBay and they basically said because the buyer provided a "report" from some random jeweler saying it was fake they sided with him. My appeal got denied. So now he has my real watch and his $1,200 back.

I have some money set aside but its earmarked for rent next month so touching that isnt really an option right now. I filed a police report in Tampa and the detective took my info but said these cases are hard to pursue across state lines since the buyer is in Ohio.

Does mail fraud apply here since this went through USPS? Is small claims even worth it given hes out of state? Feeling pretty stuck on what to do next