edit 2 - or, they intentionally lied in the affidavit about having the private key, and used the warrant to force a certain exchange to make the transfer. I'm not even sure if there's a point in doing this - maybe they wanted us to believe they cracked the encryption?
All this cyber attack story is fake coordinated shit and I don't trust anything I hear from government sources and mainstream media anymore.
This must be some very stupid russian hackers or very stupid federal agents, and both of them don't know how to use tor, vpn and non-custodial wallets.
Someone may wonder why would they do something like this, how about more regulations, reducing privacy and total control of everything we are doing online and offline.
Don't trust this and any other future ''Cyber Attacks'' you hear on news, and investigate for yourself.
That's probably what happened. The hackers needed to launder their bitcoins and they somehow got scammed by the FBI.
C'mon man... be serious and ask yourself how would they know everything in advance if they were not involved in this scheme.
This hackers sure likes to hack things Oil and Meat industry, probably Coal will be next on their list and I wonder why...

Although I can understand your point, it still would be beneficial to the community to understand how this whole story evolved. Its negligent just to act if nothing has happened. Even if its just a narrative they spin in order to make others doubt the security model of Bitcoin. If somebody manages to investigate the story properly it weakens the narrative of governments and mainstream media dramatically!