Apologies not a top pro but always keen for some help and advice
Every post I have seen on here has commented on the player and tracking the players accounts.
Surely a simple credit check into the associates / acquaintances of the player and tracking funds transferred would be a starting point. Look at friends, family etc.
I assume that PS would log the mac address of each machine (identify the mac addresses used by yer man) and every other ID used on those mac addresses.
The difference with mac address is that it identifies the actual computer. And it is therefor very unlikely that anybody other than Josh would have played on that computer.
Now if any of you guys would like to help me with tips that would be cool