I've gathered the impression that Auster's mauscripts are based in the Berg Collection at the NY Public Library. However, when I searched the NYPL's website I was unable to find reference to the collection. I would be grateful for any advice on locating his manuscripts.
I consulted the manuscripts a couple of years ago. They are in the Berg-Collection, or at least were at the time. I also found some info on the internet but I can't remember where. Then I just emailed the collection and they invited me to come whenever it suited me.
It was quite an experience!
Todd