I found on WoWHead that if you use the box it will cast a spell called Whisper that will summon the NPC Puzzle Box of Yogg-Saron. WoWHead says "The location of this NPC is unknown. " and maybe that is the point why the information couldn't be datamined, 'cause the NPC is in game, but not visible if used at the wrong place.
Code:
Spell Details
Duration n/a
School Physical
Mechanic n/a
Dispel type n/a
GCD category n/a
Cost None
Range 50000 yards (Anywhere)
Cast time Instant
Cooldown n/a
GCD 0 seconds
Effect Summon (49634)
Radius: 50000 yards
I'm very curious about it if the box could be opened I Hope that my post is helpfull in any sort and this mystery get solved soon
And Thanks Remus3 for restoring the Thread