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Why are there so many 1938 Churchman boxing sets?

I see so many Churchman Boxing sets from 1938 and they seem to be very reasonable. Did they reprint them? Are they really tobbacco cards from tobacco packs? Was there a big find of them? Are all these sets original and if not how do you tell they are fakes. Any information is appreciated....Thanks
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Mark Mulder rookies
Chipper Jones rookies
Orlando Cabrera rookies
Lawrence Taylor
Sam Huff
Lavar Arrington
NY Giants
NY Yankees
NJ Nets
NJ Devils
1950s-1960s Topps NY Giants Team cards
Looking for Topps rookies as well.
References:
GregM13
VintageJeff
Arthur
Bosox1976
Arthur