This Guy hijacked my account and sold my stuff: http://steamcommunity.com/profiles/76561198070129112 | steamname: Le Derp Demo S>1 Unusual | steamID32: STEAM_0:0:54931692 | steamID64: http://steamcommunity.com/profiles/76561198070129112 | customURL: | steamrep: http://steamrep.com/profiles/76561198070129112
Victim: | steamname: umina | steamID32: STEAM_0:0:38889619 | steamID64: http://steamcommunity.com/profiles/76561198038044966 | customURL: http://steamcommunity.com/id/beforestinson | steamrep: http://steamrep.com/profiles/76561198038044966 Also you should submit a ticket to Steam Support and screenshot your results if you've really been hijacked.
I don't think he hijacked your account. It looks like he traded a bunch of keys for that hat directly to the hijacker. If he was the hijacker, I believe he would have just transferred everything out of the account. I've marked your account as hijacked, however.