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You can't. Valve themselves usually won't do shit about this type of thing, and I doubt he's going to give them back out of nowhere,
 
he was my friend and he sayed hi will get me back after 2 days but .... and this report acepted how i can get unusual back ?
 
Guess you'll learn a lesson. Don't give hundred dollar hats to people online. They won't give you your unusuals back since you gave him the hats for free.