These are some of the things I would have put in my preschooler's boxes, if I had one. I have had the shapes to thread, and the number puzzle for geez, maybe 15 or so years. I bought the Leap Frog alphabet DVD (WalMart) for my youngest when he was 3 or 4, and found the flashcards to go with them as well.
These would make great Workbox items! HTH