Good point and I think it has been said before, we all know that LE/FBI isn't going to allow all to be revealed. Of all the things we have seen come out that we didn't know for the longest time, who knows what other details they are keeping close to the vest. Even if he is not there and the believe he was, they may have reason to want to locate where he was, what he had there, what was possibly left behind (notes, maps,etc) to help figure out where he was headed. I just hope they find him sooner rather than later.
Side note - can you imagine seeing this all done to your family and still not turning yourself in?