A little bit of history, it seems that Great Barrier Island (Aotea) was the first place in New Zealand to have a regular airmail service, by "pigeon post".
The Island is 90km northeast of Auckland.
Beginning in 1897 the first pigeongram winged its way from the Island to Auckland (to the Pigeongram Services' Loft, on Newton Road) taking less than 2 hours.
Soon there would be two pigeon-mail companies operating from the Island.
The message was written on tissue paper, attached to a bird, who then flew the message home.
This service ended in 1908 with the installation of an underwater telegraph cable to the Island.
To find out more about the Pigeon service more can be read at this Te Papa web page.
This is a letterbox cache, it is unique in that it is dual purpose. It can be a geocache (and the find is logged on the geocaching website) or is a letterbox hide (and the find can be recorded on the letterbox website).
SO WHAT IS A LETTERBOX CACHE?
It is based on Letterboxing which started in England in 1854, long before the GPS was invented.
Finders follow written instructions/clues to discover the container or the modern way is to use the posted coordinates on the geocaching cache page.
Each letterbox contains a logbook, and a rubber stamp.
When "letterboxers" find the container, they stamp the logbook with their personal stamp, and also stamp their own notebook with the stamp from the letterbox as a souvenir of their visit.
Please remember to leave this caches stamp and logbook in the container for the next finder.