I hate to say it, but it's kinda halfway cool he's out there by himself. I'd leave him a copy of Under The Banner of Heaven and In To Thin Air.
It also can't be all that hard to catch him. Track the toys he likes, put out more game camera's and such.
Hell, you could trank him and relocate him to some more remote location, like you do wolfs.
He liked In To The Wild, maybe he'd like Alaska.