Very good questions.
It never occurred to me that they left for Idaho from school. One of my questions was where was she and what was she doing while he was torturing her mother and brother? In the car, waiting?
I wonder if the phones were ever found anywhere.
If not then the police should ask little miss Hannah Idaho.
Afterall she should know what he did with them -- if she has nothing to hide that is.
They already have the ping logs of her 13 phone calls and thus know where he was and she was during each call -- and that alone could be devastating.