Treasure #1 - Map: The Badlands
Head to the Badlands Save Point and go south to where the Heartless battle took place, you’ll find the chest on the side.
Treasure #2 - Cosmic Belt
From the Badlands Save Point, head north and look behind the rock pillar to find this chest.
Treasure #3 - Map: The Skein of Severance
Once you reach the Trail of Valediction Save Point, look to the left of the Moogle Shop to see this chest.
Treasure #4 - Megalixir
Head to the Trail of Valediction Save Point and go north at the intersection, followed by going right twice once you reach the main room.
Treasure #5 - Mega-Potion
From the Twist of Isolation Save Point, return to the glyph puzzle and search along the wall near the final blue glyph wall.
Treasure #6 - Mega-Ether
Head to the Twist of Isolation Save Point and go north at the intersection, followed by going left twice once you reach the main room.
Final World - Treasure #1 - Orichalum+
Once you return to the Badlands following the Lich battle, use the portal to return to The Final World, the chest is in the open here.