Thanks for your support!
We consulted a couple of lawyers already, and here what we have:
We can go to court and we would win. The problem is that we will never find a person, who is responsible for that, because Apple don't check developers documents, and it's very easy to register Apple account with fake ID (I checked it myself yesterday when I submitted their form, they don't ask any documents at all, also my old friend who is working at Apple now and helping me with that case told me the same).
So, we will spent big amount of money for the lawyer, sue and so on. We will win. But no one will pay us compensation and no one will cover our legal service spendings. And as a result, thief will run with 60k$, and we will lose 5-10k+$ more for legal service in the UK (which is very expensive). If you have another opinion on that, I would like to hear it.