An obvious question with obvious answer, there's no way people can do about it, unless you ask the police for them to recover.

The big question for you and for the other users who keep their coins on CM private keys without transferring their coins in safe place, is why you held those coins on such manner when you yourself didnt generate that keys. Anyways, lets move on for that, you should serve this as a lesson. Keep your money on your own safety.