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Honestly, I don't even know what the point of prison in this situation is. It won't get anyone their money back, and he's unlikely to be in a position where he can reoffend in the future.
I suppose there's the deterrent angle, but I'm not convinced that there's a meaningful difference between a 10 year sentence and a life sentence as a deterrent.
"I'll just borrow these customer assets until I make it back" probably isn't a thing that someone would be deterred from whether it was 10 years or life. People make crazy gambles all the time for a lot less, and end up indebted to bookies who kill them.
He'll obviously never be in a position where he can make this mistake again, and I think life in prison doesn't fit the crime, especially for a first-time offender.
If he was stealing for personal gain, then sure, throw the book at him. But the available information doesn't make it clear if that's the case yet.
But I don't think so. I'll give it a 1 percent chance of suicide, a 1 percent chance of flight to Israel (they likely won't want him) and a 98 percent chance of rutabaga patch guard duty at Club Fed for 20 years.
Note that his girlfriend, despite her femme fatale good looks and secondary school level calculus knowledge squealed like a piggy to the law, allowing her to altogether avoid the nasty shared toilet at the women's lockup. Pretty sweet.