David, you may be correct, though Dan-Dee sold their chips and pretzels in bags and large tins.
Wish I knew this--were sales of the larger, more expensive tins slowing, and so the company launched the baseball card promotion to goose up sales of the tins? It would make much more sense, from a business standpoint, to offer a nice (today we find them much, much more than "nice", of course) free prize inside the tins exclusively. They were swell chips anyway; bags sell themselves, but then as now, the larger offering, done in a much more expensive tin with a commiserate higher price point, might just need a boost, to goose sales.
I regret not having expressed this thought in the Dan-Dee chapter of my book. Mouth-watering.
--Brian Powell