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"Postal inspectors launched an intense investigation and ended up seizing $500,000 worth of counterfeit stamps along with printing plates, presses and the machinery used to produce them. But despite the bust, the stamps continued to surface in underground mail markets. I will confess, I don't know what an underground mail market is, but there was a major one in Chicago. As late as 1981, one Chicago man was caught with 745 counterfeit stamps which he said he inherited from his father."
