Food products and baseball cards.
You don't see them as much today as in the past, but food product companies have always liked to use baseball cards as a gimmick or premium to sell their products. Especially if the product was kid oriented. Such as chocolate!
In 1984 Nestle's and Topps combined to create a Nestle version of the entire 1984 Topps set. All 792 cards!
The only catch was, they were offered in 132 card sheets as a premium with some of their products. 4000 sets were supposedly printed.
So most of the sheets have been cut, and not necessarily in the most professional manner!