These can be found around the crater area as ground spawn. In the tents, on the tents, and up on top of the crater wall. Also they are mixed in with the ground spawn found throughout Shards along with the Tracker's Guide collection.
Easiest way to get this set is to search all around in the crater, then circle around the tops, then check all the rest of the zone, then head back to the crater and repeat.
Edited, Jun 20th 2015 7:33pm by vilkavittu