So you're saying if someone matched both WC's to the same pair of prizes, they would win two of that prize. Interesting.
And, IIRC, the prize board had a check mark come up next to the prize card (it filled in the little square on the side)
You do recall correctly - a white check on a black backgroud, IIRC. (On the syndicated Narz version, I can't remember if the second column was there on the prize boards, but it was never used; the one time I remember somebody having two of the same prize by matching both cards to Wild Cards, they put the prize up on the board twice.)
I remember one show where one game had two cars on the board, and the host commented that, with the car bonus for matching the Wild Cards to each other (and, BTW, unlike with the $500 Wild Card bonus in the Trebek version, this bonus was kept win-or-lose and could not change hands with a Take or Forfeit), it was possible for someone to win three cars; I realized that it was possible to win four cars - match the two Wild Cards to each other, then, with the two free picks, pick both cards of one of the other two cards (and get a separate car for each one), then match the other car still on the board.
And was that, along with the Cash Wheel, and the $1000 for winning the Challenge of Champions, the only cash prizes awarded to players on the show?
No, we had several, like a game that gave away 100,000 pennies, 50,000 nickles, 2500 dimes, etc.; another that had denominations of sixes and nines, like: $696.69; $969.66; $666.66, etc, (really testing the memory), we also sprinkled in cash value stocks and bonds, foreign currency, people's weight in coins, and anything else we could think of to keep the game from becoming boring. 15 years of daily shows needs to have constant new gimmicks to keep the audience interested.
I also remember some occasions where a prize was, or included, some time in the "cash booth" (something similar to The Diamond Head Game's end game).