My realms been pretty active with posting when they get the box, but only one person has answered my question of "what mob?" He said the Ironmarch Stone-Singer. I'll keep asking and update with other mobs.
This being said, a quick check on Wowhead shows it drops the same greys as most of the Iron Horde mobs in the zone. I've been farming for about an hour now at Okril'lon Hold with no luck, but I'm confident that they can drop it as well because of the aforementioned greys.
I hate to be the person who does this, but my very first kill I got the pet. I got myself all set up and ready to grind for hours and bam. I'm still looking for more for friends, but I'm pretty pumped that I finally had good luck with a pet.
I got it off a grunt.
Last edited by Anarchitect on October 14th, 2014, 8:07 pm, edited 1 time in total.
Edit: Finally got it, don't know which specific orc it was from but I did nothing but farm outside of Okril'lon Hold. I ended up with 786 grey items from the mobs before I finally got it. Figure each mob has around a 50% chance to drop a gray and oi... that's a lot of orcs.