This sounds like it might have 'legs', this story. I hope so anyway.
I regret that I didn't make the effort to investigate a claim my father made, regrading Australian

'machinery' and stores that Dad swore was hidden near Rebaul Harbor. He was no liar, and was also one of the last of Aussie servicemen to leave the area. As his wife (first wife) had died while he was in New Guinea, he was in no hurry to return, so arranged to stay on until 1946.
I just love these stories and the occasional one that proves to be true wets my appetite.
Bring em home lads