Captured F4Fs in Wake Island.
No records they were tested by Japanese.
There couldn't have been any tested, there were non airworthy left.
On December 22, Second Lieutenant Carl Robert Davidson climbed into Wildcat F-9 and took off from Wake. The time was 1000; mechanical problems prevented his wingman, Captain Herbert Freuler, from taking off for another thirty minutes. It was a beautiful day for flying, and visibility was such that Davidson was able to see a flight of 33 carrier-based "Kate" bombers, escorted by six Zeros, approaching Wake Island. He radioed his discovery to Freuler, kicked the throttle, and engaged despite overwhelming odds.
Captain Freuler, racing to the aid of his comrade, saw Davidson "hot on the heels of one Zero, but another enemy fighter had come up behind the lieutenant's F4F-3 with its guns blazing. The last Freuler saw of them, the three planes were receding into the far distance over the ocean with the Grumman still tightly sandwiched between the two Zeros. Davidson was the last Marine pilot lost in the action at Wake Island.
Number 9, another of my Davidson piloted aircraft, was my subject for GB21 that I will have to finish later.