Puzzle Box of Yogg-Saron
From Puzzle Box of Yogg-Saron. By the time I had finished leveling Arch., then farming all the Nerubian fragments needed to discover and complete this, I didn't even need to click on the box to hear voices.
The 
Puzzle Box of Yogg-Saron is a rare Archaeology toy obtained through the Nerubian dig site specialty, requiring 140 Nerubian Archaeology Fragments to discover and complete.
Guide awaiting review
Level Archaeology Profession
Level your Archaeology profession until you are able to work with Nerubian dig sites, as this is required to collect the fragments needed for the Puzzle Box of Yogg-Saron.
Collect Nerubian Fragments
Farm Nerubian Archaeology Fragments from Nerubian dig sites until you have 140 fragments; you can also use a Nerubian Obelisk Keystone to supplement your fragment count.
Discover and Solve the Box
Once you have accumulated 140 Nerubian Archaeology Fragments, solve the Puzzle Box of Yogg-Saron artifact to add it to your toy collection. Using it will whisper you one of its many cryptic phrases.
Tips
The Puzzle Box of Yogg-Saron is a rare-tier Nerubian Archaeology item, so it may take multiple solves of common Nerubian artifacts before it appears as a project.
