AS a positive footnote to this experience and perhaps due in part to the existence of this group, it appears that Steam actually deleted nearly every item in this scum's bag, including his Mercenary Badge AND his Sunbeams Trilby (which was probably stolen anyway)
Hurray for Valve actually dispensing Justice!

You are friends with a KNOWN THIEF and con man. He changes his name and profile picture regularly to conduct his scams. If you have been scammed by this scumbag, please contact me and also inform Steam of the event.