Ok for starters i managed to do this at lvl 86 " Sub rogue "
Things you will need to do to get here: Either have a mage portal you to the Horde Settlement in Vale of Eternal blossum or Run thru Kun lai, and goto South west corner Where the Wall connects Kunlai, townlong and Vale then simply Jump into the Vale.
Our target farming Location is here:
Attachment 10880
now farming these mobs here at level 86 isnt all that bad if you get within range to pickpocket them ( glyph of Pickpocket " increase range by 5 yards " ) you don't pull any aggro.
All you have to do is pickpocket tab and do this over and over again as there Are 6 of the elite Mogu that pass by you every 30secs. Now Assuming your a lvl 90 If you have done a quest for the golden lotus which wants you to blow up the cave at the top of this location then this guide is Useless to you.
But if you havent done this yet then. You can farm these lock boxes for hours on end as they have chances of droping epic boe daggers.
Even tho i cannot open the boxs myself to peak inside i simply mail them to my Blacksmith and opens them for me.
I hope you enjoy the guide. I know i am a Lazy leecher but i am trying to contribute from time to time.