It's Not Your Vault

Start NPC	Keal - Norg (H-8)
Requirements	Tenshodo Reputation 3 Level, Job level 5+
Repeatable	No
Reward	Scroll of Tonko: Ichi

Walkthrough

Speak to Keal at H-8, to start the quest.
Exit Norg (A) and make your way to the door marked (B).
Turn right and head to the door marked (C), then continue to door at (D).
You will now be in a room with a boarded floor. Check (examine) the ??? (E) in the room to receive the Sealed Iron Box (key item).
Return to Norg (or, if your Homepoint is set at Norg, just Warp or get KO'd) and talk to Keal. He will give you Tonko: Ichi
Alternate map

Notes:

Every mob in this area senses by sound, so Silent Oils (or Sneak) are a must. Invisible is not necessary.