Rather than a class action or criminal lawsuit, we may be better served to file personal claims against the exchange.... If in 60 days I still have not made any progress then I will be hiring an attorney in Arizona to file a suit to retrieve hosting information from GoDaddy.
I'll drop you a private message since I know another victim with serious amount to be recovered.
Personally I wish you good luck on this case, it'd be great to see the responsible suffer at least.