Nomex: Well it looks like the cache owner is no longer active in caching, so I'm going to archive this and free up the area.
As has been mentioned, it sounds like the area around the cache is getting damaged from geotrails from cache searchers. In cases like this, and the owner is gone and can't relocate the cache, it's best to stop the destruction and Archive it.
Thanks for your cooperation!
Nomex
Northern California Volunteer Cache Reviewer