There is a place in the woods nearby here that the local school children call "Little Poo Rock". Which, I've heard, is part of a childrens song. Classy! 
Mushroom and berry hunting, trail walking, den making & sausage grilling are enjoyed by kids of various ages at the rock.
There are plenty of trails around the woods, so no need to traipse through the undergrowth until you get quite close to ground-zero.
Cache cannot be found once a few cm's of snow is on the ground.
There is no need to move any large rocks and no need to rip moss or lichen off of the rocks to find the cache. Certainly no need for any digging (we are not moles....) There could be a small stone hiding the cache from direct sight - since there had been quite a bit of disturbance of the site, and the hiding place had become slightly more visible.
Minimize My and Others' Impact on the Environment (taken from http://www.geocreed.info/ )
"Follow Leave No Trace ethics whenever possible.
When seeking a cache, practice "Lift, Look, Replace" - put all stones or logs back where you found them. Leave the area as you found it or better (e.g. pick up litter)"