Any mention as to whether or not her cell phone was found with the belongings she left behind?
I personally think if her phone was left in the coffee hut someone working the next morning would have found it and answered it when JK was repeatedly trying to call her before the phone went dead the next day.
Since we know JK kept calling Sam's phone until the phone went dead and no one answered, I don't think the phone was left behind. Which means she had her phone with her. What her phone records tell LE as far as what towers connected to her phone at this time could be very helpful in finding her. Her phone might be in a snow bank somewhere also, and LE could have tried finding the phone and her with the information they have gained by looking at her phone records but we don't know that for sure. I just wish LE would give out more info as far as what they know.
JMO