Ken Lawrence just made a noteworthy post on Richard Frajola's board, that very well may fill in a big blank with regard to this topic. He apparently published the full article in the August 2023 issue of Scott Stamp Monthly.
Quoting Lawrence -
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For decades Charles Yeager, a professor of Russian and German languages at Gallaudet College, was a philatelic gadfly in Washington, D.C. He was a personal friend of managers, engravers, and plate printers at the Bureau of Engraving and Printing, and of officials at Postal Service headquarters.
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In 2001, at age 70, Yeager moved to a hospice at Newburgh, Ind. Literally on his deathbed, he called to confide his involvement in bringing major stamp errors to the philatelic market, on condition that I refrain from publishing the story until after he and [Jacques C.] Schiff [Jr.] were no longer alive. Yeager died later that year; Schiff died in 2017. I shall publish Yeager's disclosure here for the first time.
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Schiff was the BIA's preferred auctioneer, the largest advertiser in the Specialist. He trademarked his sales "Especially for Specialists," arranging them by categories such as plate numbers and errors instead of simply in Scott catalog order. More often than not, Schiff was the first dealer to obtain and sell a newly-discovered U.S. stamp error or freak.
Also more often than not, Yeager was Schiff's supplier. Counter clerks at some Washington-area post offices — notably including the philatelic sales counter at Postal Service headquarters — searched all the stamps distributed to them before placing them on sale, agreeing to pool the errors and freaks they discovered and to share the proceeds equally.
They packaged those and held them until Yeager came in, and sold them to him at face value in the normal course of business.
In our phone conversation, Yeager reminded me that I had accompanied him to the philatelic sales counter on more than one occasion when he bought a sealed package of stamps that a clerk had prepared for him.
When Yeager had accumulated enough to warrant a sale, Schiff traveled to Washington to collect the stamps from Yeager. He paid the consigner's share of the sale price in a single check to Yeager, and Yeager passed the money in cash to the clerks who had found them.
Yeager said he knew the arrangement was illegal, but he considered it to be his service to the hobby and his tribute to dedicated postal workers, from which he took no payment for himself.
How well does this fit [Wayne] Youngblood's report that [Jack] Nalbandian probably obtained the previously undisclosed supply of $1 Rush Lamp inverts from Schiff's stock?
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If Schiff did possess an undisclosed second partial or complete pane of $1 Rush Lamp inverts, it is likely that Yeager obtained it for him, a secret that both men took to their graves.