I'm sensing that all permutations are operational.
I have received far fewer emails than cards submitted.
However, some of emails allow multiple plays. I just use the browser back button. It works for a while and then all of the sudden, it says "no more today."
I'm just hoping that each of the awards is going to get credited to my account -- there's no indication on the screen that it's linked to me or my account.
I have received one 5,000; one 2,000; two 1,000; and the rest 500 (not sure exactly how many).