After ~100 knife forum transactions over 20 years, I finally hit a bad one, (and of course it was a F&F transaction). Bought a knife Aug 16th ago from this thread. Seller thanked me for the cash and then stopped responding. After multiple attempts to contact, I'm giving up. (There are lots of details I'm leaving out about this guy, for now.) Seller is still active on this board. When I try to leave feedback on the transaction, I'm getting this error using the same URL linked above, "Invalid thread specified. You can leave feedback only for the starter of the thread or if you have started the thread." Do I have to reply to the thread before I can leave feedback on it?