Guys and girls,
I'm doing everything I can think of here, asking him, telling him, contacting his colleagues, relatives, his lawyer, and asking them too. The FBI, and talking to the police again today.
A policewoman yesterday said "you need to throw his ass in jail, girl!" That was encouraging

Yet I might not have thought of everything, and I don't have much time to get this done.
I am thinking of putting a bounty on the safe return of my bitcoins to a wallet address I specify. Anyone have any thoughts on this?
My advice: Try to avoid becoming collateral damage in tussles between the guy and his potentially numerous adversaries as the years roll on. Or worse yet, a patsy.
Oh I see what you mean. I'm not advocating violence of course, but someone owed their share of that missing $50,000,000 might decide to take a little direct action of their own and not be too diplomatic about it. I don't want to be getting the blame for that, so the bounty is off. Which is a shame, because if someone had been able to politely persuade him to hand back what isn't his, and save a young dog, they would have earned it.
Which leads us back to jail time. Perhaps, if he hands over a few passwords, he'll get less of it? Mitigating behavior is taken into account in sentencing I think. Or it is where I come from and our two systems are similar. A forfeiture order would do it as well, but then of course he would be sat in jail for who knows how long on contempt of court before handing over the passwords. Quite a pickle :/
It takes so long! If Buddy is even alive by then his heart will be so damaged the operation will be pointless.
I wonder how fast this could come to trial? I'll ask the fraud guy from the police.