It was my understanding there was a redemption card for an entire Topps run of sets, 1952-1991( the grand prize), and there were redemption cards for one each of the individual sets in the run. And then redemption cards for any card over a certain value at the time ($ 60 ? How determined ? ) plus any card from the 52 to 56 sets. No way to know exactly how many of these went in packs.
If you got one and did the redemption I assume the redemption card went back to Topps and disappeared. Never saw one myself, then or since. Still have a few unopened boxes. Still need 3 contest cards to complete what I think would be a numerical run of them