I thought I replied to this earlier.
Thank you for the links. You put a lot of effort in to your thread highlighting and capturing details about the scam, all readers and victims should have a look at it.
I cannot understand how the New Zealand police decided to not prosecute Dawson and/or Clark. If they were not guilty of orchestrating and conducting the scam and nobody else could be proven then does that mean the Auckland police should call in a neighbouring police force to carry out a review of the whole process and see if they can question potential perpetrators?
From recollection the last time I looked in on their statements (as covered via Stuff.co.nz etc) the NZ Police's investigation is "on going" and they (NZ Police) aren't giving a running commentary on their investigations. IIRC the media said something along the lines of all employees have been questioned as well as board members etc.
This would mean those interviewed would have done so under what we call "under caution" - similar (but not the same as) the U.S.' "right to silence" (which in itself is not the same thing as that countries' Fifth Amendment" - i.e. refusing to answer questions under oath)