steamrep.com - report him there, provide them with all the info you can, next time check anyone you'd want to trade with there
This is his profile if I'm not mistaken http://steamcommunity.com/id/krtoslav
Thanks. I found his profile on steamtrades at http://www.steamtrades.com/user/krt1223.
Unfortunately I can't report him on steamrep as I've mislaid the log (wasn't careful with it as it was a small trade).
I think you mean on steamgifts. I haven't seen that anywhere here (http://www.steamtrades.com/trade/gCrkO/steamtrades-site-rules) & if I have committed an offence by mentioning a scammer, I'm happy to talk a mod about it to clarify.
I added the user name because I saw the same done in threads around the site & it seems a good idea to offer krt1223 a chance to make amends.
unfortunately i didnt read you warning message about him. my NFS HP gone because of this bastard. i wrote to steam support with copy of my chat with him.
Adding this as a warning because I just got scammed by a guy with a bunch of rep, readable English, 70+ games, and a cute penguin picture on his profile. None of the above prevented him from stealing a fairly cheap key at the expense of negative feedback on here.
He has now also, predictably, added negative feedback to my profile, which is laughable as you can easily see the game I had advertised now on his steam page.
krt1223 offered me Sleeping Dogs for Batman AA GOTY (it seemed a bit much, but I did the trade because I've seen a swap here for the same two games, he had +rep on his profile (presumably from indie trades), and SD has been sold for around 5$ paypal on strades). He gave me a multiwinia key then blocked me immediately.
krt1223, if you're reading this, your feedback is otherwise positive so this is RIDICULOUS over a game you can pick up for 5$ in sales.
Unfortunately I've mislaid the chat log (I wasn't careful with it as it was a small trade) so I can't report him on steamrep, but you can see my thread for Batman here: http://www.steamtrades.com/trade/lfXNq/h-batman-arkham-asylum-goty-key-gone-scammed-by-krt1223-zeno-clash-gift-w-offers and click on his profile here: http://steamcommunity.com/id/krtoslav to see the game in his list.
Steamtrades profile: http://www.steamtrades.com/user/krt1223
Steam profile: http://steamcommunity.com/id/krtoslav/