As you'll see on Old Cardboard, quite a few Negro Leaguers do have legitimate cards from their playing days that everyone would categorize as a card. They're mostly from Cuba and Puerto Rico. But there are a few who appear to have had nothing. I don't think there's anything of Ben Taylor or Louis Santop, for example.
Besides the Negro Leaguers, the only other players who arguably don't have cards are some of the pioneers, like George Wright and Candy Cummings. Wright has cabinets and CDVs. Cummings has maybe a tintype or something like that.
If you move into executives and umpires, quite a few have nothing.
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