Chests of dried grass next to (Pathfinder: Kingmaker)

All kind time of day.
In General, it is.
When I started the game a second time to expand, so to speak, of the game experience, suddenly found that in the prologue (Chapter 1) there are some special chests. If they put something, then the hidden treasure will open. Distinguished by the fact that there are a lot of cells open. These chests - locations of Abandoned hut or in the fortress of the Stag. There should be grass bunch to shove.
So, I was surprised to find that the same advanced chest and the bowels of a sycamore tree, where the Golden toad is.
I tried to pasovat there of things but didn't work.
For the game did not seem critical, but it is interesting!
Let's experiment and share emotions...