I´m not sure if screenshots are enought reliable data for law use. But if you have stored copy of your communication with gox´s support which contains exact amounts, it should be definitely helpfull.  Anyway I think we´re screwed up, unless the big players will fire current management and rescue the gox exchange as service. Then we have real chance to get our money back.

Btw: Have you already seen this? I don ´t know the relevancy of this document, it can be fake as well, but I think it is good to see it http://www.scribd.com/doc/209050732/MtGox-Situation-Crisis-Strategy-Draft  ... if that is truth, we still have a chance.