Got an answer from bitstamp:
Bitstamp may share private user information if there is a relevant
investigation carried out by the authorities. To victims of a crime we
would kindly suggest to contact police and file a report.
Too bad we can't access NSA XKeyScore and friends, we already would have that data...
So it takes a little bit longer, Police -> Courtorder -> Bitstamp gives out data.
@vdragonIf you are reading this. I think with bitstamp we have a pretty good chance to get to you,
so this is the last chance to man up and pay our monies back. If you ever used bitstamp
with your real information you will have a bad time(tm).