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In page Envelope:
"The first known envelope was nothing like the paper envelope of today. It can be dated back to around 3500 to 3200 BC in the ancient Middle East. Hollow clay spheres were molded around financial tokens and used in private transactions. The two people who discovered these first envelopes were Jacques de Morgan, in 1901, and Roland de Mecquenem, in 1907.[citation needed]
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