Lost and Found is more of an adventure route than anything. An involved scramble to the base gives you access to a right-leaning crack with three distinct roofs that leads to the first belay at a tree on the southernmost face of Shirt Tail Peak. Continue up the face via the path of least resistance until you can join the upper pitches of Future Primitive to the top of Shirt Tail Peak.
This route it located on the southernmost face of Shirt Tail Peak along the ridge rising up behind the Potato Chip. From the top of the Potato Chip, hike north along the ridge until you are blocked by the cliff face that rises up to the lower summit of Shirt Tail Peak.
A standard Eldo rack.