Elven Castle has 4 treasure chests, all locked behind doors requiring the Mystic Key. Return after receiving the key during the Elfheim chapter to grab the Mythril Hammer, Bronze Gloves, and some Gil.

Mythril Hammer
Upper right room, far left chest

800 Gil
Upper right room, middle left chest

700 Gil
Upper right room, middle right chest

Bronze Gloves
Upper right room, far right chest
| Item | Location | Image |
|---|---|---|
Mythril Hammer | Upper right room, far left chest | |
800 Gil | Upper right room, middle left chest | |
700 Gil | Upper right room, middle right chest | |
Bronze Gloves | Upper right room, far right chest |