Throwback Treasure Hunt 12-12-12

A few years ago, as a throwback to one of my favorite hunts, The Secret by Byron Preiss and because the date 12/12/12 was quickly approaching, it was decided to bury a ceramic casque, a ring and a few other items then create a hunt around the number 12. Twelve months should have been enough to solve it but you could only get the puzzles in a calendar format at the time of the release. Alas it was...