The checklist shows that Herschel Walker is card #63 in the set. The back of the card shows how the mail in redemption for striped cards was supposed to work.
The next card is the #1 surprise redemption card. You could mail this card in for a "surprise package", though I have no idea what that was, and despite trying to find an answer online, could find no one who redeemed one.
Lastly, the best player pulled from the packs was: