If the thief transfer your tokens to centralized exchange address, so you can try to contact the exchange's official customer service, ask them to provide information about the thief, then maybe you can get the information of the thief.
Without the real proof that the OP was the owner of the original amount in the Ethereum address, there is no way that the exchange service will reveal the identity of the user who is actually a thief.
Changes are not so reliable in the terms of the security. They are actually looking at their own interests in the end.
If the amount that has been transferred to exchange is huge they are already operating with it and for them revealing the true identity of a thief, even if they trust you, would be unacceptable.