hey guy...not trying to be smart ,,but it don't matter what's on the ground,,it only matters if they're coming in enough to warrant you hangin over it..if they're using it,, it ain't hard to tell..if you see poop then they're using it...actually i like to see more than a couple piles and should be fairly fresh...careful goin in and stinkin up the place with leather boots...good luck..if u see the poop it's just a matter of time...i'd love to come up there and show ya..lol