I see on cache logs people say things like i thought i would go for this one because it is the 15 most favorited in all of eastern downtown ottawa or i wanted to find this one because it is the 5th oldest unfoud cache in all of western lanark county. how do people know this are there some lists somewhere that keep track of this, or do people just look up all the caches in wetern lanark county and determine the oldest unfound one that way?