In reply to Flinticus:
Judging by the amount of stuff he'd surrounded his 'camp' with he spent a lot of time stealing other stuff. He's got more dustbins than we have and he certainly didn't make them or find them. He stole the lot - and a lot more.
That said I think there's a little more to this story than meets the eye. I wonder for example, how well you'd be able to actually talk after 20+ years without company? And did he really manage to stay isolated without anyone stumbling across his hideaway, given he was so close to other humans and houses?
Ishi, the last survivor of his tribe the Yahi, he was discovered by europeans in California in 1911 or thereabouts. He spent his entire life knowing he'd probably be murdered - as had all the rest of his tribe - if he was discovered by whites, and despite living in or around remote valleys, in an extremely well hidden location he and his immediate family were discovered by a group of surveyors.