I'm a letterboxer with a collection of 6000+ to date, mostly from Dartmoor UK. I have Googled all information available concerning letterboxes in New Zealand, but there seems to have been little activity over the last few years.
I will be in NZ from mid January until mid April and would love to add a few Kiwi boxes to my collection.
Is there anyone out there with updated information?
Note: I mean real letterboxing, not geocaching.
Thanks in advance.....

I had to look this up - the reference to geocaching convinced me it was not just stealing people's letterboxes, or knocking them to the ground (which is what happens here) or stuffing people into letter boxes or doing the trainspotter thing and taking a photo. It is a regular activity, one I have never heard of, and I suspect few Kiwi's have, well described here.

Cool hey!, been going since 1854 too, a whole new life of travelling possibilities
Good site myshkin but haven't read much past the intro.
#OP, so do they have like Letterbox conventions or Gymkhanas and that sort of stuff, maybe nudist colony boxes for nudists, and is there a rating system to give you more kudos for finding the more difficult ones, like say on the side of a mountain or for sailors, on some more remote islands?
Sounds like fun actually, and maybe even potential to have a cyber version - bury a box in a thread and have a register and clues branch, hmmm, PM to Andreas on way.

Geocaching uses GPS, letterboxing doesnt as far as I can see.
Looks fun, but I cant find any reference to it happening in Australia (try 'letterboxing Australia' in google and you get some nice addresses of letterbox manufacturers....)