Accepted Report: 76561198059432817 (El Jefe/^3Tomcat^7(Mario))

Scammer:
steamID: ^3Tomcat^7(Mario)
steamID32: STEAM_0:1:39403572
steamID64: http://steamcommunity.com/profiles/76561198039072873
customURL:
steamrepURL: http://steamrep.com/profiles/76561198039072873

Probably alt of scammer:
steamID: El Jefe
steamID32: STEAM_0:1:49583544
steamID64: http://steamcommunity.com/profiles/76561198059432817
customURL:
steamrepURL: http://steamrep.com/profiles/76561198059432817

Proof:
He got this Unusual El jefe http://www.tf2items.com/item/774786678 from Tomcat (who is marked as scammer) + El jefe has Tomcat in friend list + El jefe has only 37 hours in tf2.

They're both in TF2 at this moment but still they can be friends/brothers or just he has 2 PCs/laptops.

or he could be using sandboxie.

This.