Archived Report Somebody used fake midddleman to got my Roshan Baby

Can anyone tell me, what to do to get my iteams back, I got pic of talk, also I got those guys ID, pls be care of trade in middleman, comfire his ID first. Thank you~
his id http://steamcommunity.com/profiles/76561198072804779/
fake middleman http://steamcommunity.com/id/LeonD2T/