These woods are getting a little bit spooky lately!
This is a Letterbox Hybrid Cache.
A letterbox is another form of treasure hunting using clues instead of coordinates. Once a letterbox is found, you place your stamp mark in the letterbox's log book and place the letterbox's stamp mark in your own log book.
A letterbox hybrid has coordinates, making it a letterbox and a geocache. You can put your stamp mark in the geocache logbook and get the cache's stamp mark in your own personal log book as in letterboxing, or you can simply sign the log book as in geocaching, or both. Many cachers have a special book just to collect the stamp marks from all the hybrid caches that they find.
This letterbox hybrid contains a traditional log and a pencil.
There is also a stamp. The stamp inside a Letterbox Hybrid is not intended to be a trade item; the stamp and ink pad are meant to remain in the box so that visitors can use them to record their visit.
PLEASE LEAVE THE STAMP IN THE CACHE!!
BRING YOUR OWN INKPAD IF YOU PLAN TO SWAP STAMP MARKS. This stamp is self-inking but it may not last forever.
To read more about letterboxing, visit the Letterboxing North America web site.
11/4/25 I checked on Boo today, and I think I know why the coordinates keep bouncing. It is fairly close to the US Geological Survey Magnetic Observatory, which has magnetic instruments that can identify earthquakes, tsunamis and bombs all over the world. They have warnings on their perimeter fence that mention this. My daughter was logging this cache today, and I had just taken a 2nd reading on the cache, and I stood right there and watched as the new reading and the old reading bounced over 70 feet up and down & up and down! WOW! OR...maybe this place IS haunted! Ha ha! I upped the difficulty rating on this cache due to that, but if you go straight off trail at the faded blue diamond on the tree, you should walk right to the knee-high stump. Good luck!
Article on Geophysical Observatory
Another blurb about the site
