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Always check the reputation of the traders you're talking with (especially if someone randomly adds you)
His steamtrade profile is : http://www.steamtrades.com/user/Manhunting
You can check if someone is registered here on steamtrades by searching him with his STEAM_ID64, like this : http://www.steamtrades.com/user/id/76561197993400330
Edit : To report someone, you have to use the steamrep forum. Anyway someoneelse already reported him HERE. If you want to report him (do it, will let them mark him as "scammer" faster) just follow the instruction on this link -> http://forums.steamrep.com/threads/howto-report-a-scammer-look-at-acceptable-format-before-posting.51/
http://steamrep.com/search?q=http%3A%2F%2Fsteamcommunity.com%2Fprofiles%2F76561197993400330%2F
this one scammed me
how to report him
scammed me for 2 dota keys
please report him