Odd Bone Necklace Drop Rate

[steeds]

Hi Everyone,
I've been camping Lesser Shamans in the Warrens for the last 6 levels looking for Odd Bone Necklaces. Wiki says they drop 10% of the time (added player note), but I don't believe that.

I have seen 1 drop, so I know they exist. But after killing 50 shamans and starting to see them green out I don't think I'll ever find 7 more (assuming trivial loot code is a thing).

How am I supposed to realistically complete this quest? Is this a cruel joke, or do I just have really bad luck.

Has anyone completed this quest? Is there a specific spawn point which drops them? Do the Greater Shamans also drop these?