Loking for information on where to find details for Boxholders for PO
Boxs in Auckland NZ

I suspect that this information is confidential.  You could email NZ
Post, the largest company offering this service, and ask them.
mailto:csc.help@nzpost.co.nz

What exactly do you mean by details?

NZ Post once published a PO Box directory (I'm not sure if they still
do, I have a feeling that it might have been discontinued), that
listed names of the holders who wanted their details made public.

I am pretty sure that when I signed up for my PO Box, in Auckland, NZ
- that I was asked if I wanted my details listed in some sort of
directory. So it must exist in some form.

Indeed, NZ Post are the people to ask.

I've got a suspicion that the directory that you can sign up for is
nothing more than a masquerade allowing the company to sell your
address to direct marketers.  Cynical?  Maybe.

The word from NZ Post is that, yes, there was such a thing, and no,
there isn't any more due to privacy laws.

Not even for sale to direct marketers apparently.  Odd really, they
sell residential addresses!