Where is it?

Boss in Gnomeregan. See the boss's loot on the instance page.

Drops

From EG Link (collected in Forever by other players, not confirmed with Forever Scout): share of 1 opened loot windows.

Item	Chance	Source
Iron Lockbox	100%always (1/1)100% chance (always) – common (1/1)
Workshop Key	100%always (1/1)100% chance (always) – common (1/1)
Spidertank Oilrag	100%always (1/1)100% chance (always) – common (1/1)