I believe that is just a long driveway to a single home.
Snipped- I didn't notice anything that looked like a fence in any of the pictures I saw. I did notice an old fence post in the interview with the landowner in that open pasture area, so I'd assume he doesn't have livestock. No real reason to maintain a fence if you don't have livestock. Too much work, especially in the woods where trees/limbs fall. Of course, that's just IMO.
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If they followed footprints, they should be able to tell if there were 2 or 3 people walking together. Should rule out whether the girls were walking in that area voluntarily or if they were walked/followed back there. I'm wondering if footwear was taken in the search warrant?