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I do not at all think that he just up and left.
I think his venture got larger than he expected, he ran into some serious technical trouble and some dipship went crying mommy to the police, who promptly shut the place down.
Also, even if everyone does get their money back, I think they should still use the scare they will have gone through as a lesson in attitude toward Bitcoin security (see link above - "Trust No One").
Lastly, I don't think the police shut down anything, as some order executions have continued to trickle out ever since he made the interface inaccessible and I don't think anyone would try to go against law enforcement measures in such a visible way.