I think given that there was no resistance from the accussed that he was or is Guilty and negotiated a "I'll go quietly & quickly if you leave the feds out it" type deal.
One rumour was a "Bribes for jobs" type scam....
the other more feasible one was a Senior Air NZ exec's very expensive and not so common laptop was reported stolen and some time later the same exec identified his missing laptop hard-wired into a 60' yacht owned by the recently removed Fleet Captain.
Just rumours remember
Hud