The list isn't scam. If you are not on it it could mean you had less than 10 BTC on your account, the list starts from 10 BTC and more.

The usernames and email adresses come from the 2011 hack, the accounts without had been created after the 2011 hack. The other data (user id, balance, last login) come from the latest mt gox leak. When it says "No trades found" it means the bitcoins have been bought after 2013-11, because the leak contains only transactions till that date. Edit: "No trades found" can also mean, that there haven't been any trades, but the coins have just been deposited into that account.

Check that list http://www.acceptbitcoins.co.uk/wp-content/uploads/2014/03/mtgox_balances.csv, maybe you find yourself on that. If not, your data got lost, maybe. It's contains every gox account from the leak.