Surely the guys who caught him have profiled his 'style' and knowledge, and if a load of info about him and tutorials with his style start popping up, they'll investigate his avoiding of the 'no computers' ban. It'll be hard for anyone to avoid surveilence for the first few months/years (or am I just paranoid? I don't live in the US anyway...but since when has that stopped the FBI? ).

N.B. I know of Mitnick, I don't know exactly what he's done when and to whom.