Randy Clark writes:

The chief point that I want to make here is to suggest that someone look into thelibrary of the New York Historical Society. Since the manuscript is not in ANS,this would seem to be a likely alternative repository for it.

But further, Bushnell's coins were sold at auction, by the Chapman brothers, soonafter his death. I have been able to examine the catalog of the sale, and canreport (in case this is not known to the inquirer) that the sale included 3000 lots,of which 2847 lots were of coins and related artifacts, 152 lots were of books and catalogs that made up his numismatic library, and the one remaining lot was his coin cabinet. None of the 152 lots of library material included his manuscript.

Still further, Bushnell's historical library was also sold at auction, by theMessrs. Bangs & Co. I have not seen the catalog of this auction, but I have seenthe entry for the catalog in the National Union Catalog, and can report that itstitle is: Catalogue of the library, etc., of the late Charles Ira Bushnell, to besold at auction Monday April 2d and four following days, by Messrs. Bangs & amp; Co.It contains 286 pages, and there were 3,452 lots in the sale. Copies of thiscatalog are reportedly held in: Library of Congress, Philadelphia Union Library,Duke University Library, Cornell University Library, American PhilosophicalSociety Library (Phila.), University of Michigan library and the University ofVirginia Library. Possibly a reader nearby one of these sources can check thecatalog to see whether or not the missing manuscript was among the items in this sale.

Then the problem will resolve itself into locating the buyer!