Found him up at loc 12, 341, 103. Must have been a roamer as he was at a spot where no PH's are normally.
Slight edit for above - this spot above is his spawn point (and then he roams after that).
However, there is a 6th spot we've seen him up at as well, right outside the lower entrance of the tizmak caves at -1371, 1300, -101.
One more spot we've seen him at that doesn't appear to be on the map so far: -100, 581, 177