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Andrew S.Not sure if there has ever been a value listing in any guide for the envelopes. They are very rare. The Philly Find was sold in a Leland's auction several years ago and consisted of an entire high grade set of cards and about 3 dozen of the envelopes. I think the lot went for 150K+
The only other time I ever saw envelopes for sale was on eBay in 2006 when Shigley's grandson sold the entire series of 24 envelopes (near mint) along with a raw ungraded blue bkgd. Honus Wagner in about ex condition. My bid got blown out of the water. I think it went for 9K.