#1 - March 10, 2013, 2:09 p.m.
I checked them out on wowhead and it looks like there's currently a drop rate mistake on these.
On about 2,000 registered loots, the horde trove drops it about 30% of the time, where as the alliance side only 0.3%.
http://www.wowhead.com/item=95496#contained-in-item
Quite a disparity and seems like an obvious mistake :/
Is this known and when will it be hotfixed?