Treasure chests in sequence 4 - The Slaver | Treasure chests AC Chronicles: China Guide

You will notice the chest near fortress walls

CHEST 1/2 - First treasure chest can be found at the beginning of the level. It's hard to miss it as you will walk next to it on your way to main mission objective. More specifically, is it placed left from the place where Shao Jun must climb on fortress walls. In the chest you will find Scroll 5.

Chest is near the first slave (side mission objective)

CHEST 2/2 - Second treasure chest can be found later, after completing the leap of faith from synchronization point. Pass through two new guards but don't use the right ladder leading up. Instead, go down at the spot which is sometimes controlled by one of guards. Go to the bottom and you will notice the chest with Scroll 6 on your right.