Mogu have two rare items. Dig sites can be found in Pandaria.

Notably, many level 85+ players can benefit from Quilen Statuette .

Below are WoW Dig Site Articles, separate pages dedicated to each listed Artifact.
Artifact	Notes	Skill
Quilen Statuette	Level 85 Mastery Trinket	525+
Anatomical Dummy		525+

Below are Mogu Common items with Wowhead links.

Common Artifact Links:
Edicts of the Thunder King
Iron Amulet
Manacles of Rebellion
Mogu Coin
Petrified Bone Whip
Terracotta Arm
Thunder King Insignia
Warlord’s Branding Iron
Worn Monument Ledger