The RAE liberary used to be run by Brian Kervel who used to collect historic RAE documents and artifacts. All of this stuff was part of the RAE museum. His retirement coincided with the closure of the RAE and it’s museum. All of it was transfered to the science museum and is held by them. I would expect that anything “historic” like that would have ended up with him and saved by him. His office contained some amazing things.

Rgds Cking