Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
Where Chest of the Shadowy Vanquisher Fits
Other Items Named Chest of the Shadowy Vanquisher
2 other items in the current build are also called Chest of the Shadowy Vanquisher. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Chest of the Shadowy Vanquisher
Blizzard numbers items as they are created, so the named items next to ID 89264 (89259 to 89269) were usually added in the same batch as Chest of the Shadowy Vanquisher: the same quest line, zone, vendor or reward set.