Vintage greeting cards Coby Pets

Vintage coby PET SET Oversized Greeting Cards. This set is from the 1970s or earlier. I know this because when I was a baby I was given the card with the shaggy sheep dog! This is a complete set of 10 cards however, there are only nine envelopes. The cards are perfectly good, the box has some denting and damage and a small hole. See photos please. These cards are large, approximately 8 x 10, I don’t have my ruler handy, again, please see the last photo. On the box, they refer to them as “giant“.