They only searched quite a small area initially then - rather than increasing that search area - they stopped.
I found it unbelievable.
Not necessarily - this area was reported as having been extensively searched early on. But the searches may have concentrated on the accessible ground, while the body was trapped on steep escarpment above, inaccessible to search parties and shielded from the view of helicopters and drones by trees.
Bref: the search parties were looking down, but the body was above .