There is one problem with this though. Someone hacks an account, burns it with a scam of some sort, and then on the way out says "by the way, my account got hacked and the hacker got private keys too". Then the real owner shows up, who possibly never really lost those private keys, and signs a message. I hope you have a bit more to go on than just a word of a (potential) hacker.
We sure do, and I'm certain you understand the reason why we're not able to disclose any more than this. There was a combination of factors that made us come to this decision. It's never easy to leave an account locked, more so a legendary account such as this one and we've said many times that, even if there's a 1% possibility that we're not returning the account back to it's original owner, we'd rather have it remain locked instead of it ending up in the wrong hands.