I've a stack, unpunched
used them for a completely different purpose: analog modeling of geologic deformation. No, really. We'd take the cards, stack them, draw reference lines and circles on the side, then shear the cards and document the changes in angles and how the circles changed into ellipses. Good times.
Also recall them as my first introduction to computers, on tours at a local university on a science trip, oh so many years ago. Had them at our high school too, but was more interested in girls than computers.
(pod)