This story is not accurate. A family member, former intel officer featured in books in movies, told me about Japanese war looting, as stated in the history book, The Gold Warriors. The particular Japanese officer was guarding one of the 175 Japanese treasure sites that were later recovered by the dictator Marcos. Read the book, and the Amazon Reviews, as to where the gold went.
RE: One Man’s War - The Incredible Story of Lieutenant Hiroo Onoda (featuring @andrewawerdna as author)