It should be pointed out (yet again) that saying the fraud/theft involved $500 million worth of bitcoins is rather meaningless, since it presumes to value every single lost/stolen bitcoin as worth the last trade price... whereas of course such a large amount of bitcoins could not have been sold at market value without significantly crashing that market value before even a small proportion had been sold.

And, as drrussellshane didn't quite say loudly enough,

if you aren't the sole holder of your own bitcoin (private keys) then you don't own any.