Where did you even find this guy?
Mods don't moderate trust, and if you don't provide the scammer's username on the forum then how do you expect anyone to help you tag the guy?
I see that you've been scammed by gift card scammers at least two times now. Anyone offering gift cards at such steep discounts are scammers, I'm sorry to tell you. And anyone operating with a locked and self moderated thread most likely has something to hide as well.
In the future, avoid all heavily discounted gift cards that are selling without receipts or proof of purchase, and avoid gift card sales in general from untrusted members of the forum. Don't send first and use escrow, and look at the reputation of the people you are dealing with. The guy that you got scammed by previously (YoutubeTV) is a well known, long term scammer, which is why his trust is in the red.