Thexian Searchers may also be found located on both sides of the river from about ( -919, 4, -671 ) Copy/waypoint -919, 4, -671 to ( -873, 48, -1261 ) Copy/waypoint -873, 48, -1261. If not many are, up kill everything because other mobs are ph's: a sap urchin, a motley kodiak, maybe even the Nek wasps.
Many of them can be found near The Pot. ( -967, 0, -568 ) Copy/waypoint -967, 0, -568