Re: Were it a real country, could not the courts act?
Remember when some coins were stolen and the changes thr protocol to protect those coins?
I am by no means an expert, but you seem to have really misunderstood what happened way back when. As far as I understand it, bitcoin essentially forked the project and rolled everything back, putting everything back where it was ~2 days prior. All the trades and things that were legit needed to be done again, the coins that had been snaffled were recovered in that they were reset back to the place that they were previously.
To do the same here, things would need to be rolled back by years. Even then, all that would achieve is undoing the 500 bitcoin to 12 separate accounts transaction and would put them all in his original one. Assuming the key to that was also on the same piece of paper, all that would have been done is that the bitcoins are all together, though still inaccessable and useless. Oh, and also that every transaction over the last however many years would have been voided for every person who uses bitcoin...