Three years ago, a businessman bought a collection of roughly 20 million sports cards from its reclusive owner. Now he wants to show it to the world. Memorabilia and Souvenirs, Trading Cards, Collectors and Collections, Baseball, Topps Co, Records and Achievements Three years ago, a businessman bought a collection of roughly 20 million sports cards from its reclusive owner. Now he wants to show it to the world. NYT > Business