I honestly feel you are over thinking this.
He / she probably just wanted something nicer than the mass produced garbage that you can buy any and everywhere right now. Instead you could feel flattered that they like your work instead of feeling suspicious.
People come to ebay for the unusual, artist made, one of a kind, odd ball, unique stuff. They probably use Amazon for everything else they buy online.
Since the pandemic hit i get new zero feedback customers buying daily and some are old returning ebayers actually because its been YEARS since they purchased and its just easier to set up a new account as they have a new address, new bank details, new email, cant remember their years old login info, got married had a couple of kids since their crazy days on ebay buying Hot Wheels cars etc etc.
You are displaying sellers remorse and doing the 'what if' scenario based on assumptions.
The only way to vet customers before hand is to join a club or private community where you know everyone and also know their morals and values
...did you price it too high and are worried about the feedback or a return or something?
Good luck to you, i hope it all works out for you
