Hi Bermuda,
"For whatever reason that is much harder than it sounds"
You on right on the ball there. Even the massive sell-down of CDU on the 18th August, 2010, did not activate an Audit by ASIC even with the repesentations made for such to be undertaken.
To investigate Nominee Account accumulation I would think that you would need ASIO on your team just to get to fist base.
cheers,
Max