I'm not talking about permission from Bitcoinica/Intersango, I'm talking about a legal warrant that allows him to do what would otherwise be considered a criminal act.
Since Bitcoinica did not file a police report (as far as I know), from legal point of view there is no reason to assume there is a criminal act involved. Technically, Bitcoinica's computers were (allegedly) compromised. That would be the criminal act if it was reported.