I've messaged an online friend who is resident in NZ and he has said he will look into it.

The outfitter I hunted with over there claimed to do NO fenced hunting at all but is no longer in the business.

I hunted with Leithen Valley in the NT for the buffalo cull a few years ago. They are outfitters in South Island as well. The son, I hunted with seemed a good guy. They probably do free range as well as the fenced stuff. Did not hunt with them in NZ so can't comment on that, just on the guy I hunted with. Claydog knows him well as well.

BTW you can also hunt without an outfitter in NZ quite easily, but as with all these things, an outfitters knowledge makes it a lot easier and less time to work it all out.