I've been kicking around the DD card issue again with another member here. Since this thread was initially posted has anyone seen a punchboard with cards verified in it? As noted above it would have to be at least 1.25" deep to accommodate the cards. I've been searching eBay and every show I can find but haven't seen a candidate. As for the cards, here's an Averill that shows the borders and the numbers on the back:
The cards were definitely folded into little 'sticks' of paper and the numbers are consistent with the serial #/prize # scenario I suggested.
Here is a generic one that is 1.5" thick:
