[OldMissileer]

I’d draw a diagonal line across the tops of the decks with a felt-tip pen (Sharpies hadn’t been invented yet) against just such an eventuality...

You could make rows as comments that would not be read by the computer. My first rows always were comment rows and I would type the card's number. The only problem was that sub-routine I tipped onto the floor had a few hundred cards.

[null and void]

Yes, but this was much faster than having to read every one of the cards. Put ‘em back in the box and any card that was out of order wouldn’t have its stripe on the diagonal. Sticks out like a sore thumb...