If you are rich or you have lots of bitcoin so that you can hire a private investigator or someone who can get information on people, there's a chance you can track them down.
I think that only a private investigator can do such a job, since official sources will not be able to conduct an investigation or initiate criminal proceedings against cyber-crooks. Since the crypto currency is illegal, all actions will be illegal. So you're really right about this. About the private detective.