I am the Space Collections Curator and FB-111A "crew chief" at the Wings Over The Rockies Museum in Denver on the former Lowry AFB and I can offer some additional info.
Our museum is currently the home to the No. 3 B-1A prototype (s/n
74-160). This aircraft was disassembled into about 40 pieces and trucked to Lowry in 1987 still wearing its three-tone desert camouflage. It was reassembled and repainted with the then operational three-tone gray and green camouflage which it currently wears. This aircraft was used as a weapons loading trainer and was accessioned to the Wings Over The Rockies Museum by the USAF Museum after Lowry closed in October, 1994 and the Museum opened in December,
1994. The Museum also acquired the related AGM-86B ALCM cruise missiles, B-61 special weapons. A little known fact is that most of the USAF aircraft in display in museums are actually "owned" by the USAF Museum and are "on loan".
The No. 1 B-1A prototype (s/n 74-158) was last dispositioned at Rome Air Development Center in New York. The current whereabouts of this aircraft is somewhat of a mystery. In preparing a research paper for the Museum on the topic of the B-1 prototypes, I called the B-1 program office for information. No one there knew for sure what had happened to the No. 1 B-1A. I had some information that indicated that No. 1 might have been dismantled with the weapons bay being used as a weapons loading trainer and they said that was certainly possible. There is also information suggesting that No. 1 may be in storage at Edwards AFB. I'd be interested if anyone had definite info on the fate of B-1A No. 1.
And to complete the story, the No. 2 B-1A crashed on Aug 29, 1985 and the No. 4 B-1A was recently moved to the Strategic Air and Space Museum, in Ashland, NE after being on display at the USAF Museum in Dayton for number of years. The USAF Museum now has a production B-1B to take its place.
More information about the Wings Over The Rockies Museum can be found at: