I didn't look into all that... but I looked on eBay and one seller was selling a pack of 5 with the box they came in so I'm guessing they were some sort of sweepstakes...OK now it makes sense. Those are the 8 guys who had regular Braile cards that were inserted into 1992 Action Packed Factory sets. Was there any info on how one acquired either the 288 cards in the Mint set or the 8 cards in the Mint Braille set? I've guessing thery were available though some special offer on the fsctory sets.
So the only true parallel set was the Mint cards. THe Mint Braille cards and the regular 24 Kt cards (like the Emmitts I traded you) were parallel sets but skip numbered and much smaller than the base set. And only the 24 Kt. Gold cards were inserted in packs as far as I know.