sounds very much like this guy:
David Wood
david.wood2970@gmail.com
Same thing, emailed me out of the blue in response to my "buying orval overall items" n54 posts - "how much will you pay?" "what do you want to pay?" and when i didn't respond for a couple hours he'd re-send the emails. at first he had a couple 100$ cards he was offering that were worth about that. then randomly he had a 30k card that he wanted to sell me lol. after i asked his N54 username he said he just got my name off google and never emailed me again. this was all about two weeks ago now.