That is my nightmare. Finally seeing the shadow of something big enough to possibly be the scale and losing it. Considering I spent all of yesterday trying to get one...I'd hate to lose that one chance. At a certain point, the randomness of getting a drop grows weary on me. I understand taking some time to get an item but spending days to get a single item is a bit on the tedious side of things. I'll keep trying though since I need that scale.
I can't imagine me doing anything but selling one as soon as I get it so I can get them off Raven myself just because I can't see me ever trying to farm a 2nd one should the game be so kind to even give me one.