Whoever got these wallets better sell them and get a good security company on rotation quickly before anyone find out who they are. Seems like wrench attacks been been happening a lot more the last year.
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It's not the "financial system" that comes and hunts criminals with guns, but police, acting based on what laws they seen has been broken. And stealing $3 billion is as illegal if it was Bitcoins, as if it was Euro or USD.
So in your scenario: The 3 billion will reappear at some point and they will raise flags. And at that point there is a convenient rendezvous point between law enforcement and the perpetrators. And we can all quibble about whether the authorisation is appropriate or not (not all "requests" are requests and most won't even need anything close to a court order). But it's damn convenient to follow the money