It's grouped according to the name of the inspector, which doesn't help you find individual units. I've reviewed almost all of them and made numerious copies, but haven't created my own index yet. I recall reports for the district of SW Virginia, but don't remember seeing Vaughn's Brigade listed.

It's mentioned in this informative National Archives article, and the following National Archives catalogue from the mid-1990s.
http://www.archives.gov/publications/prologue/1995/winter/civil-war-arms-and-equipment-2.html
http://www.rootsweb.ancestry.com/~mopemisc/comppt3.txt