Jason Boyko sank underground, and even giving a huge reward for finding him didn't help:
To be honest, no one really bothered to really find him, or sue him after his identity became known - and the reason is that it all happened at a time when Bitcoin was only worth a few hundred dollars. I'm sure any qualified investigator would easily track him down, unless he really tried and disappeared somewhere in the wild.
There is information about him even before he became a bad boy on the Internet, and all those who lost hundreds or thousands of BTC should go to Canada (Saskatoon) which is the right place to start the search.
https://www.canlii.org/en/sk/skqb/doc/2003/2003skqb139/2003skqb139.html