We have never refused to take back an item we have sold on eBay. When we put an ad up; we already have the item in a box waiting for a shipping label, and if someone buys something before the post office closes... it gets taken down that day.
Kudo’s to you. I have been using eBay for years and never had a bad experience although I have had a couple things arrive that were bused. Got an iPad that already had a user, don’t recall the seller but they replaced it quickly. I have bought many thousands worth of computers and parts with no problems, of course I am strictly a Mac person so that may make a difference.