The article says they “tracked” his trip as he drove east. I’m skeptical they lined up a group of ground and air resources to literally follow him 2500 (or however many) miles to PA. That would take massive resources.
I wonder if they “tracked” him using a gps tracker, his phone, etc.
But maybe they did literally physically tail him. But to my mind, if they did, that’s much more than 4 days of “surveillance.”
I also saw (cnn I believe) that he was at an auto service shop with his dad and the car in PA, and while there conversed with an acquaintance on CNN. So it sound like he was there at least by the 16th.