What are the possibilities?
1. They are camping in the backcountry, just like Carlie Trent and Gary Simpson. Either on public or private land, but they are not in a campground or hotel. Those places would be too easy to find them. It would probably be an area in Tennessee, or a neighboring state, in an area that TC is familiar with.
2. They fled to Mexico or Central America. Highly unlikely I think. The only way they could get there would be to drive. They would have to have Mexican liability insurance and a permit to drive past the Mexican border area. That would leave a paperwork trail. They could not fly anywhere from the US, because they would need passports, which ET does not have. Fake passports are not an option. TC doesn't have enough money for that. All in all they would stick out like a sore thumb in Mexico. It would probably be easier to apprehend them there, then in the US.
3. A possible sympathiser, maybe a friend of TC is helping them hide out someplace. Like the way Samantha and Gianna Rucki were hidden on that ranch in Minnesota for two years.