Head to the cache by passing a silverbirch tree. You are looking for a black turtle box container which has a range of swag inside.
Named after an old song which I used to sing in Brownies and Guides - "Land of the silver birch, home of the beaver, where still the mighty moose wanders at will, blue lake and rocky shore, I will return once more...." I have no idea what it had to do with Guiding in the UK but it sounded great sung quietly in two parts, 30 years later I still know the lyrics. (Mummy ManorMuppet)