Supposedly 'Satoshi' was found in Australia… is there any way to verify this?
If someone purporting to be 'Satoshi Nakamoto' wanted to prove it, he/she could do so by signing a message using one of the same signing keys that 'Satoshi Nakamoto' used to sign one of his early messages during the release of bitcoin.  Or, he/she could announce that they will make a bitcoin payment from an address believed to belong to 'Satoshi Nakamoto' to some other address, then actually do so.