eBay

I sold a pair and the authentification failed, i cant understand why? What happpens now? Could they have failed because i marked them with UV pen? Any help will be highly appreciated

HelloI sold an item on eBay and posted it out the next day. I kept tracking the parcel and for 10 days it was showing that the parcel was still at the depot, collect+. I contacted collect+ and they told me they would look into it but it should be del...