So to recap, this is the situation to date as I understand it:
--No one has found more than 10 of the 12 pieces of The Fall, which are all supposed to be in the Hinterlands.
--No one can confirm that there is or ever was a piece in Wolf Hollow, which is marked as a mosaic piece location by the Prima guide.
--No one knows for a fact where to find the last piece or two (depending on whether the Wolf Hollow one is supposed to be there but is bugged or if the guide is just wrong). One or both may be hiding up those bugged ladders, which would be like the two pieces of the Archdemon found in the dragon's lair in the Western Approach, but it cannot be confirmed.
At this point, unfortunately, I think we're stuck praying for devine intervention. (Perhaps that horrible pun will inspire some?
)