Credits: Pegasus Knight, Valhalla, Enaeius
To find treasure, have a character stand on the marked positions. Thief, Rogue or Whisper characters have the highest chance of obtaining them. For other characters it might take a couple of tries.
Chapter 3
Yellow: Coin
Chapter 4
Yellow: Coin (only 1)
Red: Beastfoe (only 1)
Blue: Master Seal (only 1)
Chapter 5
Yellow: Coin
Blue: Concoction
Chapter 6-1
Yellow: Coin
Blue: Arms Scroll
Chapter 6-2
Blue: Master Seal (only 1)
Chapter 7
Yellow: Coin
Blue: Master Seal
Chapter 8
Yellow: Coin
Blue: Arms Scroll
Chapter 9
Yellow: Coin
Blue: Olivi Grass