BeenBurned, need your advice on what or how to give feedback to the seller who sold me the fake Gucci. I don't usually give a negative feedback. I would also hate to receive a negative feedback if I truly didn't know that I sold a fake bag. The bag stinks though but I didn't ask if it had a smell when I bought it. Negative or neutral or nothing?
TBH, I'm not sure you'll be able to leave feedback. Since the case was closed in the seller's favor and you got the refund by appealing the decision, I suspect that the case is probably still shown as being in the seller's favor. (And when the seller wins a case, the buyer can't leave feedback. And if they do, it can be removed.)
Since I can't see the case and don't know whether it was actually the decision that was reversed or if it was a courtesy refund, it's impossible to know what happened. (You can probably tell though.)
Since the seller can't relist the bag, a warning about it won't help future buyers about that bag anyway.
Wait for other opinions for different points of view. I'm not an advocate of dinging sellers unnecessarily. Keep in mind also that it's very possible that the seller didn't realize the bag was fake. Even the TPF authenticator deemed it as genuine the first time so if fake, it seems to be a close one.
OTOH, the seller does sell other highly faked brands and perhaps a neutral feedback might serve as a warning to buyers to verify that what they're buying is genuine. (Neutral and negative feedbacks no longer count against a seller.)
Personally, if I were the buyer, I wouldn't leave feedback at all.