these http://camelot.allakhazam.com/item.html?citem=1374 are the ones from mithra, same stats and effects, different name.
Thought I'd clear up a little confusion on that part.
They (normal, not the silvered ones) seem to drop off any forest related critters tho, I have a friend that got a pair (normal, not silvered) off of a poacher, and other got em off of a cutpurse.