Not quite sure abt
the Japanes one , it could be a hoax.
http://www.timesonline.co.uk/article/0,,3-1631062,00.html Also :
"Missing WW2 Japanese Soldiers Denounced as Hoax
Danny Chan
A pair of apparent Japanese soldiers hiding in the southern Philippines since World War II has been denounced as a hoax by the Japanese government. The story of two alleged World War II-era veterans on Mindanao island touched off a media frenzy in Japan and made headlines around the world for several days in late May. But after the two failed to appear after four days of waiting, Tokyo declared the story a hoax.
Over 100 Japanese journalists and diplomats descended upon the mountainous Philippine island after reports emerged that two Japanese soldiers ensconced on the island for over 60 years were ready to emerge from their jungle hideout. The octogenarians were brought forth by a Japanese timber businessman who identified himself as Asano.
Mr Asano said he had never met the two soldiers but had heard of them through a Filipino contact who had in turn heard of them through another contact. Nevertheless, Japanese embassy officials subsequently waited for a meeting with the elderly men that never materialized.
The Japanese media had identified the two alleged stragglers as Yoshio Yamakawa, 87, of Osaka and Tsuzuki Nakauchi, 85, of Kochi. Mr Yamakawa was a first lieutenant and Mr Nakauchi a corporal in the Imperial Army’s 30th Division. Imperial Japanese Army records list the two men as dead, according to one news source.
The two were members of a unit deployed on Mindanao towards the end of World War II. According to reports, they became separated from their unit and later chose to settle within the communities inside mountainous and lawless Mindanao because they were afraid they would be court-martialed if they returned to Japan. Reports further stated the pair were anxious to return home. Japanese Prime Minister Junichiro Koizumi had earlier told reporters the two would be repatriated if that was their intention.
more here :
http://www.sikhspectrum.com/082005/hoax.htm