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The cards were concealed among postcards and various paper products, and they nearly ended up in the trash, Professional Sports Authenticator said.
Orlando said there were only 15 copies of the cards known to exist before the discovery.
"This is one of the greatest discoveries in the history of our hobby, involving one of the greatest rarities in baseball cards from arguably the most popular baseball card set ever produced," Orlando said.
He said the cards are likely to fetch a seven-figure sum.