You can file a report at http://steamrep.com/ though. So others will be warned.
But you need proof (screenshots).
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Since I've been burned all I can do now is to warn others. If you encounter the user HAF (hidden) avoid trading with her/him at all cost. Luckily all that she/he got from was (only) two Dota2 keys.
You don't have to tell me that I was stupid. I'm aware of that. Since I didn't encounter any problems regarding my trades in the past 6 months I was delusional about the trading community. Lesson learned! It won't happen ever again.
One piece of advice. Don't take the trading feedback on Steam for granted. He has 60+ positive comments to make you think that she/he is a trusted trader which is obviously not the case.
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