Another Major Plot Hole
First, the police would scour the property on either side of the river from where Judd was found. The police would also look up the butts of all of the property owners. Kidnapping is a Federal offense, so the FBI, with all of their resources, would be involved.
Second, so the girls are being held in former underground slave quarters that no one else knows about. Right! Consider the logistics of furnishing the place and feeding six girls daily. You already have a full time job, so where do you get the time? There would have to be a parking place close to the quarters to carry all of the crap in. If you have to go through the woods on a daily basis, a trail would be formed that would be visible and easily discovered by blood-hounds. Where do the quarters get its water and waste disposal services from? The local town?
In summary, this movie is a total bunch of Hollywood unrealistic B.S.