Is there something I am missing?  Satoshi had a stash, it is clear enough by now.  But while it is clear to us, is there any legitimate way of proving which Bitcoin is still on hold in the addresses owned by Satoshi?

And then a few other things come to my mind.  What if Satoshi simply did not care enough by now to move his Bitcoin and by the time he wants to move them, they are impossible to move?  What if the Bitcoin becoming impossible to move are simply some Bitcoins still 'sleeping' on an old hard disk in the attic of a person who simply has not gone through it yet.  Is there an actual accurate number of how much Bitcoin Satoshi owns in the first place?