factor,
You are right.
It was a Japanese soldier on a remote Pacific Island.
All his comrades had been killed,and so he lived off of the land for next 30(or so) years or so.
The villagers knew he was there,but of course he thought they were the enemy.
This might interest you?
http://en.wikipedia.org/wiki/Japanese_holdout
Also some years ago,the Scott Polar Research Institute(at the South Pole station) came across a case of(12 I think) tins of Heinz Baked Beans,which had been shipped there in 1911.
They sent them back to the UK,4 went to Heinz as a goodwill gesture,and from the remaining 8 they opened 2 and heated and ate them(at a post Scott memorial dinner!) it seems they tasted very nice.
Of course they had been frozen for over 80 years,BUT it just goes to show that tinned goods CAN last quite a lot longer than just 6 or 7 years out of date.
boxtops,
I must remember that tip,I shall use next doors cat as I don't have one! LOL