I remember hearing or reading about this when it happened ('74). I also recall reports of Japanese on a 'remote Philipino Island' still waging war against the locals. But they couldn't find them. :o
I've always intended to buy Onoda's book but have never seen it on a shelf (if I had, I would certainly have bought it).

This bloke must have got some pile of back-pay!!!! I suppose that's what he 'bought the farm' with (not colloquially......

).
In fact, there were many, many incidents for the first few years after the war, where Japanese in remote areas had to be 'coaxed' out and told that the war had been over for 'so many' years. But the stories and accounts died off around 1950, when the vast majority had been found or surrendered for one reason or other. This one is most certainly a 'stunning' exception.