I remember throwing a heap of those self-paced training videos out about 10 years ago. I still have the certificates for successfully completing the "self-track" courses. (You took a computer based test at the end and sent it off to Apple to prove that you had understood the content on the video tape).

Someone would have signed a non-disclosure agreement with Apple to get them originally, so the legality of selling them on eBay is somewhat dubious...