The problem is even if there IP is traceable, What are you going to do about it? This is Crypto World, This is the one and only MAJOR downfall of crypto.

Lets just say EVEN if you have his physical Home address. Unless you take the law into your own hand, and drive-by his house Or knock on his door and kidnap him and force him to send the coins back.

There is NOTHING the police will do. Most probably look at you and say whats bitcoin?

Its a Sad fact, which is why many cyber hacking criminals are in wonderland atm, Karma is a bitch and I hope that guy get run over by the next car he crosses paths with