Very nice checklist Leon (I'm jealous). I didn't realize it was Walt Corson's collection that was referenced in the article. I found this old Net54 post, which references a letter written by Nagy.
http://net54baseball.com/showthread.php?t=84458
Goodness gracious! Walt must have had an incredible collection!!! Let me get this straight, Nagy purchased 400,000 cards in 1966 from Walt. Yet, check-out this quote in the letter by Nagy...."
By the time I had the opportunity to get his collection many of his cards were sold..... "
Lovely Day...