Screwed or not

My idoit cousin recently purchased a iPhone 4 from a girl at his school on facebook for $150 met her at school and exchanged the cash for the phone. Well shortly after he got home he found out that she had activated lost mode and locked the phone, he messaged her and called her asking her to please either bring him the sim card and unlock the phone or give him his money back and she said no and blocked him and changed her facebook account so he couldn't call the law and report her and the school will not do anything.

So is he up **** creek with out a paddle and stuck with the new $150 iPaperweight 4 or is there still hope that I can save this brick for him?