Prototype Number 4 found at the Nakajima plant in Koizumi, Gunma prefecture. This was the one that was brought back to the States for testing.
Three photos of Prototype Number 2 found in Misawa base, Aomori Prefecture. It suffered serious damage on the fuselage, as can be seen in the photos, when it was strafed during an air raid.
All photos from NARA.