Then it got posted again as a common item. I'm almost best friends with Hillpaw. So unless someone beats me to it, if he does give me the hat I'll post up about it.
EDIT:
It is moggable. The Tillers quartarmaster gets Cloth, Leather, Mail, and Plate versions after Hillpaw mails you the cloth one.
For those who don't know.
Chen's bamboo staff comes from a Monk Class Quest in the Peak of Serenity, as well as his belt, from the same quest chain.