This happened to me about 5 years ago on ebay when selling an iPhone. I was an eBay member since 1999, 100% positive feedback, occasional seller (about once a month). I sold a perfectly fine iPhone, buyer with no feedback history complains to eBay he never received the phone despite tracking showing it was delivered. He also leaves me negative feedback (in broken English). eBay sided with the buyer immediately and at…
One interesting niche that eBay is considered both great and terrible for is watch buying. There are often descriptions that note "the watch in the picture is the watch you receive!" -- which is hilarious -- and "no buyers with less than n feedback" etc. It's considered a minefield for myriad reasons, and it's kind of a necessary evil if you want affordable vintage pieces or the increasingly rare "barn find" type of watch. But there is not an insurer or delivery proxy that I know of. On Craigslist, a lot of this is mitigated via the local nature of it, e.g. I will only buy your watch if you meet me at a Rolex dealer and get it authenticated on the spot before hand off.