The facts that incriminate the two couples include the following:
Sources I read : Feds Seize $3.6 Billion In Stolen Bitcoin, Arrest Couple Five Years After Massive Crypto Exchange Hack
The question that comes to mind is do you think the FBI will return it to its rightful owner?
It's hard to know what the US government or law enforcement will do with the stolen money, with the way they so easily take money via "civil forfeiture" all around the country. That would be the right thing to do, although there will obviously be an amount lost by the laundering techniques, you'd expect a large chunk of it to be recovered. As is so common, greed was the major downfall of these criminals, if they had figured out a way to just withdraw and keep a million dollars, it's very possible they could have lived a very comfy life but instead they wanted more and more.They could even have obfuscated their tracks by dumping large chunks of money on unsuspecting people and muddying the trail for investigators - but they wanted it all and will now likely spend a large part of their lives in prison instead.