This is an important question and I will tell you exactly what I know.
... Simpson's massive research files on Audie Murphy had been dispersed and were no longer a unified collection at one library
I have a hunch that there may be some confusion on the collection being broken up.
The collection was maintained at the Greenville Public Library and it included the notes but also Audie Murphy memorabilia provided by the members of the family and the Audie Murphy Research Foundation. I first saw the memorabilia in 1996 and in 1997 when I was photographing the items at the library for the website.
Unfortunately, I never had enough time to look at the notes. The Simpson's notes were just too massive for my one hour visits even though the librarian staff were willing to let me examine them.
After my visits in the late 90's, I discovered the memorabilia was moved out of the library to several destinations in the early 2000's.
The notes, I believe, remained with the library and are still there today... but may have ended up at the American Cotton Museum.
The memorabilia was sent to the American Cotton Museum and also to the Smithsonian.
The reason for the collection being broken up is disappointing because it was due the activities of souvenir hunters and what I view as as thoughtless researching.
Around 2002 or 2003, I returned to the library hoping to see to the Audie Murphy room and verify that the memorabilia was still there. I was going to try and get better photos and descriptions of all the items and possibly get some photos of the Simpson notes. I spoke to the head librarian ... I don't remember her name. But she was a very nice, great Texas lady, quiet, and had been at the library a long time.
Unfortunately she told me the memoriabilia was gone and shipped to other secure places. This was when I found out about the items being transferred to the Smithsonian and also the American Cotton Museum.
I asked her why this happened. She said "vandalism". People were coming through and slowly picking apart the items. An example was Audie's military footlocker. The plywood lid, interior, leather straps were slowly destroyed as souvenir hunters were removing slivers of wood, address labels, and picking away anything they could carry for their personal collection or to maybe to sell. Other items were being ruined too.
The staff recognized that they could not put someone in the room to watch it, so they started locking the room. But limiting access made it harder for people with honorable motives to get to it too. It was decided that there needed to be a better solution. So the items were transferred out to the museums.
I confirmed this later with the AMRF and Ms. Larryann Willis. Later, I found out that the Smithsonian items were returned to the American Cotton Museum, at the request of family members and the Foundation, where the collection is now back together.
As to Simpsons notes, the librarian told me during my early 2000 visit said that they were also having trouble taking care of those. She said the notes were not nearly as organized as they once were. I asked her what happened to them.
She told me that a researcher writing a book and had spent a one or two week period in a private library room (I think it was the same room the memorabilia was then kept in ... i.e., the Audie Murphy Room). He sifted through the material and copyied/xeroxed everything in sight he thought was important to the research of the book.
He was taking a leave of absence to do this research too. He worked at a steady pace for the period of time he was there. He arrived at the library early in the day and left late in the afternoon.
When the researcher concluded his "research" he left the library but didn't return the notes to the library in the same conditiion they had been given to him. They were left in the private room for the librarian staff to sort through and reassemble. The librarian said the notes were never really ever in the same condition after that.
I believe the librarian at that point offered to let me look at them but I felt it was probably prudent not to make them drag it out. I don't know if the library staff ever put the notes back together in their original shape.
They said they were working on it. They knew the notes were important. What I don't know is whether or not any of those notes are now missing or lost because of the disorganization or theft, etc.
Hopefully, others can update this question. I don't know if the librarian I spoke to is still there ... she may be. But I would start there if you want to see the notes. Your next inquiry should be with the American Cotton Museum. Some things may have changed (and probably have) since my visit 7 years ago.
Last of all, because of the difficulty in reaching her, you could attempt to find out from Larryann Willis, the Executive Director of the Foundation who is tough to reach. She may have a handle on the notes. I do know that early in the 2000's, she was in touch with Mrs. Simpson, and for this reason may be able to track down the location of the notes. But I think they are still in Greenville at either the library or the AMC.
If you would like send an inquiry to Ms. Willis, send me a private message and I will help. There is also an email address at http://www.audiemurphy.com/amrf.com