From the recollections of Richard A. Day:
“I landed in Kure (Hiroshima) Japan in Oct. 1945. It was the biggest naval base in Japan close to Hiroshima so I did get to walk on it. Picked up a Morse Key from an untouched warehouse behind a small hill mound. Had it swept and it is safe. Sent it to Robert Merriam as a genuine artifact from Hiroshima. Two months later, on 7 Dec 1945, I was a civilian in Peterborough, NH. Kure had warehouses full of brand new radio equipment, which I shipped home. You now have it all. It is probably the largest single collection in the USA of Japanese WWII electronics. I know the Signal Corp museum has essentially nothing.”
There is a very large WW-II military radio museum in Yokohama, Japan. The owner of the Yokohama WW-2 Japanese Military Radio Museum, Takashi Doi, has been very helpful identifying and documenting this radio collection.