I've just placed two new caches. I had intended to have these at the Geolympix, but because of a hardware failure (the voltage step down card that should have supplied the Raspberry Pi failed), that didn't happen.
So I've placed them now; two big tubs, formerly containing garden fertilizer, now filled with hard drives, books and other assorted computer hardware. The hard drives might work, but don't bet on it; they're drives that have at least to some extent, failed in the past. At worst, you can get a really strong magnet out of the inside.
It's actually a series of three puzzles; you solve the first two to find the first cache, and that leads you to the puzzle to solve the third one. The caches are called:
Dog and Bone
Which might give you some idea of what it's all about. They're in the reviewers hands right no; if there's no problem, they should be out in a day or so.