One could almost expect Charlie to at least track down some of the minivans, not every minivan would lead him to Claire.

In fact, he could even be afforded a year or two to work on it, but still not track down every minivan. Even if he might eventually confirm that the minivan carrying Claire and her family arrived at Isleton, he wouldn't be where she went from there.

And even if Charlie found out that Claire's family and the escort boarded a freighter in Isleton, he was not tracking them any