Vasco

Best answer as chosen by Asker / Ratings
Here is the location of ALL of them:

Area: Bamboo Grove
==================

Treasure Chest (#01) Hi-Potion, (#02) Ether and (#03) Mythril Shard:

When you start this area face towards the big rock to see one Treasure Chest
(#01) to the right (Southeast) of the large rock and two other chest (#02 and
#03) to the left (North) of the large rock.

Area: Checkpoint
================

Treasure Chest #04 = Hi-Potion:

Near the rocks at the Northeast corner of this area on the other side of the
Small stream/river.

Treasure Chest #05 = Mythril Shard:

You will find this Treasure Chest near the small wagon/rickshaw

Area: Mountain Trail
====================

Treasure Chest #06 = Hi-Potion:

You will see this Treasure Chest at the edge of the cliff at the Southwestern
Part of this area.

Treasure Chest #07 & #08 = (#07) Recovery Recipe & (#08) Ether:

Climb up onto the Northern most platform of this area to find these two
Treasure Chest.

Treasure Chest #09 = Mythril Shard:

You will find this Treasure Chest on the ledge just south of the path leading
To the Village.

Area: Village Cave
==================

Treasure Chest #10 = AP Boost:

You will find this Treasure Chest behind a small wagon/rickshaw. Along the
West wall.

Treasure Chest #11 = Hi-Potion:

You will find this Treasure Chest directly in front of you when you enter
This cave.

Area: Ridge
===========

Treasure Chest #12 = Hi-Potion:

You will find this Treasure Chest at the Southeastern edge of the cliff.

Treasure Chest #13 = AP Boost:

You will find this Treasure Chest at the Northeastern part of this area near
Some rockets and wagons/rickshaws.

Area: Throne Room
=================

Treasure Chest (#17) Queen Recipe and (#19) Ogre Shield:

When you enter this area go down the stairs to the right and left of the
Throne and you will find (#17) and (#19) in front of you at the bottom of the
Stairs.

Treasure Chest (#16) AP Boost and (#18) AP Boost:

Go along the wall on the side of staircases to the left and right of the
Throne to find (#16) and (#18).

Treasure Chest (#14) Torn Pages, (#15) Palace Map, (#20) Mythril Crystal and
(#21) Orichalcum:

Now climb up onto the ledge just behind the throne to find (#14), (#15),
(#20) and (#21).

Hope I Helped