A photocopy of what you are looking for can be found in Box 16, Folder 1...(pg 10 of the PDF) with the original at Niels Bohr Library: "Guide to the Papers of Richard Phillips Feynman, 1933-1988" - http://pdf.oac.cdlib.org/pdf/caltech/feynmanr.pdf
It seems quite a lot of work to be done on organizing all this.
"... The great mass of Feynman's working notes are scattered on miscellaneous sheets of papers, envelopes, placemats, and seemingly whatever else was at hand when thoughts struck him. Feynman occasionally took time to organize these into a system for files, although only a small fraction of his notes found their way into such a system. The great majority was left in a scattered condition and grouped during the processing of the papers as well as possible by subject matter. Many miscellaneous papers remain..."
Since the article is already 5 years old ("(2017)" missing from the title), I'm not the first one thinking this. A Web search led to this post: https://www.reddit.com/r/Physics/comments/8smja9/is_there_a_... but nothing more, unfortunately.