Rereading your project page a little more closely, I realize now this mod is somewhat useless, as it does NOT save the items put in the chest if you save the game.
I tested it, and sure enough, any items in the chest, without changing area, are gone if you save and load the game.
To make this useful, and actually usable in the event of a Dtragon Age crash etc. you may want to attempt to make the storage permanent across Saved Games.
Is this possible? Not sure, and it's probably a good deal more involved. I'm going to start looking at the toolset this weekend most likely, but I have to assume that it is indeed doable. Mishka the Hoarder mod seems to save across saved games.
Kinowek