A letterbox geocache is a special kind of geocache, based on a treasure hunt game that predates Geocaching by more than a hundred years.
The participants would need to use various clues to work out where the final container is.
The container would contain an ink stamp that the participants would use to stamp their 'Stamp Book' they would use their own personal stamp to stamp the book inside the container. The stamp inside the Birdbox is not tradable.
For this game, if you don't have your own personal stamp, you can write your geocaching name in the log book. Please do not remove the stamp inside the container.
At the given coordinates.
You will need to search for the foundation stone.
Please use this to determine the final location.
At the final location, you will find a Birdbox.
For the South coordinates, use the eight digits date on the foundation stone, subtract the five digits from your last three digits of your South coordinates.
S XX XX.xxx
For the East coordinates, use the alpha numeric where
E 0XX Xa.bCD
a = second line, second word, first letter.
b = first line, second word, third letter.
CD = the eight digits date, last five letters.
The cache is only available during business hours.
The owner is aware of the Birdbox geocache, but might not assist.
Luck of the Irish to you Lasses and Laddies!