BTW, Just going through my eBay feedback, I saw a little note from eBay. One can only challenge bad feedback 5 times per 1000 feedback responses, over a 12 month period. Used to be, if it was BS feedback, you could challenge it and it would be revised if you could prove your side. Now you only have limited challenges. I admit I don't know exactly how this works.
So FYI, but this is new to me. Don't know how long this has been this way.
Personally I haven't had to challenge one in years, but it does happen.