This is exactly the reason why online wallets/exchanges shouldn't be used. I haven't used coinbase, and doubt that gambling sites will allow you access to the private key, but the very least you can do is contact them, and see if they can help you out. Maybe, you'll get lucky.
But, without a signed message you aren't going to get your account back regardless of the proof provided.
Yea I realize that my account probably will not get back to me. At this point im trying to get the account flagged. Ive seen it myself throughout the years and understand that you dont just take a newbies word for anything. What kind of proof can I provide to the community when the hacker deleted what looks like most of the addresses I ever put up? I mean when I started out here, I only heard of bitcoin because I have wanted to play poker online, so if you look at my post history its like 2 years worth of poker talk, sports betting and generally always about gambling, now the posts are not even in English.
Do I need to let a trusted member on the trust tree to log into my email and see the messages first hand? or maybe screenshots from other sites where I use the badjacks99 name? I have had a SWC poker username there since they were still seals with clubs. C'mon trust tree guys, tell me how I can prove my story.