Think someone could have buy back account balances for pennies on the Dollar and make a huge profit
Congrats.
Well, there is no way you could verify the account balance or account validity back then.
Someone could claim to have an account with 1 btc when he didn't.
they should have all the data. the site wasn't compromised or anything. IF you have an existing balance, send an email following the instructions on the site, and ED should sort you out. So far, no one has complained about not receiving their coins back.
Everyone that has emailed has received their money back (minus losses to 1D1ce1) if you had a balance.