SHow your georges vezina cards!
The Willima Patterson #25 Bert Corbeau was the card that was redeemd for the free pair of skates. I think that you sent the entire set in to get the skates and either the company held back the Bert Corbeu or it was "redeemd" meaning it had a hole puched into the card or stamped with the companies name on the back. To have this card in any consition - redeemd or not - is so rare only a few people have either seen the card or have the card.
Also, to make matters worse the card was short-printed to make it harder for people to complete the set because the company did not want to give everyone free skates threfore they had to limit it someway.
Hope this helps,