In this guide I will show you all the treasure chests I found so far that are accessible as soon as you start the game. The items they hold will help you both on start and later on.
Outskirts of Portia
As soon as day two starts and you get the control over your character, leave the house and look across the road at a broken stone fence. Right at that spot is the first treasure chest. The chest contains Worn Gloves.
After you collected the worn gloves move towards the farmhouse across the wheat field, there lies Sophie's Ranch. In the area with chickens and ducks is a shed where the treasure chest is located. The chest contains 25 gols.
If you look to the left of the shed, you will see a windmill, at the base of that windmill you will find the next treasure chest. To reach if you will need to jump on the roof and advance up to it. The chest contains 2 Dried Apple Slices.
Head towards the docks to get the next chest. It is located on a roof of one of the bigger buildings. To reach it jump up the ladder and then move to the back of the house right past the small garden area. The chest contains 2 Colorful Furs.
Town of Portia
Once you reach the Peach Plaza go to the left until you get to the area where town wall connects to the walkway. Jump on top of the wall to get the treasure chest. The chest contains 2 Salad Sauces.
To reach the next chest you will have to jump on a ledge after you collected the prior chest and follow it to the other side of the tower. The chest contains a Blood Stone.
The final chest on top of the wall is located on the other side of town gate. Just repeat the previous step and walk on the ledge to reach it. The chest contains a Talisman.
After that return back to the area where you climbed the wall and go towards the Cafe. Behind the building is another chest. The chest contains 2 Dried Apple Slices.
Follow the road up to the Church of the Light. Once you get to the top, go behind the church from the right side and you will see a chest in a bush. The chest contains Sunglasses.
Enter the church to get another chest. The chest contains 2 Dried Apple Slices.
Return to Peach Plaza and go behind the A&G Contruction building, the chest will be on the end of the path behind a tree. The chest contains a Painting: The Lonely Windmill.
If you head towards The Round Table restaurant you will stumble upon another chest which is located on a building next to it. The chest contains 50 gols.
After that go up the overwalk and follow it all the way to the end where you will find another treasure chest. The chest contains 2 Herbal Mixtures.
Jump off the overwalk to the main street and get to the Martha's Bakery. On a balcony next to it is a treasure chest. The chest contains a Blood Stone.
Run past the tree at Central Plaza to get to the Research center. Near the entrance to the right is a small fenced garden in which the next chest is located. The chest contains 2 Apricot Juices.
Next chests are by the Portia School. One of them is inside a bush on the left, the other is behind the school and the last one is inside the it. The first chest contains a Grinding Blade, the second one contains 2 Marble and the last one contains a Small Satchel.
Get on top of Total Tools where the next treasure chest is. The chest contains 2 Colorful Furs.
Run up the walkway to reach the upper part of town. Next to Petra's house there is a chest on the end of the alley. The chest contains a Blood Stone.
Next to Petra's house is mayor's house, go behind the house following the path on the right to reach a treasure chest. The chest contains 2 Salad Sauces.
Behind the same house but from the left side is another chest. The chest contains 2 Copper Wires.
Besides the mayor's house is Django's house. Go inside the house and you will find a chest next to the bed. The chest contains a Practice Sword.
If you follow the road next to Django's house you will reach a roofed part of the walkway. Climb on top of it to find the next chest. The chest contains a Talisman.
Turn around and climb on top of The Commerce Guild building. Behind a triangular wall on the front of the building is a chest. The chest contains 2 Copper Wires.
Return to Django's house and follow the path up the hill, you will find another chest on the first level of that path. The chest contains an Aroma Apple.
A Bonus Chest
This chest will be easier to access if you go for it after you advanced in the story.
If you follow the path above the school, run past the Mysterious Man's Store and you will reach a gate to the next region. The gates will be closed on the start of the game and the treasure chest is on top of them. To reach the chest climb up the hill on the left and follow the ledge on a building on top of it. Once you get to the end of the ledge jump towards the chest and you will get a promt to open it mid air. You won't be able to land on top of the gate as there is an invisible wall which is removed once you can advance to that region. If you manage to open the chest you will get another Painting: The Lonely Windmill.