I discovered this type of cache while in Utah. Got permission to bring the idea up here.
There is a virtual 3D world sketched up identical to ours, but with differences. One of the differences is this cache. The trick is to find this cache in the virtual world. Once you find the virtual cache, use the information found there to make the grab in the real world.
Cache is a small lock and lock.
FTF can take any one item for free, all others, trade.
Please do not leave any hints, clues or other help in your logs.