Re: FBI says it recovered $2 million in Bitcoin Ransomware payment... How?
I see, that makes sense. So if we rule out the possibilities that an exchange just handed FBI their key; and that the FBI hacked the hackers; and (of course) that FBI cracked bitcoin with quantum computers... what are the odds? 
Really, really small. Could it be possible that the FBI somehow scammed the hacker with their mixer, and only then applied for a warrant to move the coins further?
That's probably what happened. The hackers needed to launder their bitcoins and they somehow got scammed by the FBI. I believe there are lots of things in the background we're unaware of, but I guess the mixing would be the most logical. They didn't recover them all, so the hackers may tried the mixer firstly just to see if it's properly working.I'm also surprised that the hackers didn't even bother to try something like CoinJoin first.
Try mixing 60 BTC with CoinJoin. 