I’m opening this for those who like to put scammers on block, so here is the latest situation with this guy:
I’m also opening this for Gameflip stuff to see in case he opens a dispute now, or gives me negative rating.
You can see complete correspondence here (key is used now, so no harm in showing it):
(open in new tab)
Here is Steam response (yeah, you can get this from Steam support now in most cases):