This whole thing is classic.

If you have no morals and some free time you can rip people off and pretty much get away with it.
By his actions he has already proven he has access to the missing BTC.
So, he has to spend sometime waiting, in jail granted, to be able to use the funds, but hey that is a small price to pay for 600,000+ BTC.

hmmm, maybe I need a career change?