The map tells LIES to me. I found the potion where it says the key is. I'm assuming the key is somewhere up on the higher ground. However, it doesn't matter if I ask them to look for normal or good treasure they always look to this one point on the lower ground that has NO treasure at all there. It is annoying. *sigh*
But after some painstaking experimentation... I did finally find it here:
http://i131.photobucket.com/albums/p...eytoMidgar.jpg