As per today 2015-03-23, I can confirm that this has been fixed -- "a goblin penmaster" now drops both Bone Key and Bone Necklace,
Along with A Stone Key from "a goblin penkeeper" you can now turn them 3 in to "an enslaved iksar" and recieve "A Coarse Iron Needle" and thus finish second last Khukri quest!
Thanks Devs for making this happen
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//Schnickusaurus