I do not sell internationally, yet a user from Serbia was high bidder on one of my chips, did not pay, and immediately left negative feedback.

I called E-bay and was told people can set up sister accounts based in other countries, that's how a person from Serbia could bid, through a U.S. based sister account.

E-bay refunded my fees and removed the negative feedback.

https://www.ebay.com/sch/stiv17/m.html?item=293068030512&ssPageName=STRK%3AMESELX%3AIT&rt=nc&_trksid=p2047675.l2562