That's some typical scamming scheme of gambling sites, sometimes deleting all information before doing it so the users won't be able to have any evidences. I think you should move this to scam accusation even though it's gambling related, I think you should try to inform them too on their ANN thread about the situation and for people to be careful on the site while your issue with the Bitdice is not yet fixed.

Here's the ANN thread of Bitdice: https://bitcointalk.org/index.php?topic=5304279