Originally Posted by Hohei
No dice I'm afraid, was already opened.
Also if you're still looking for Acc #13 it's in Olta Village. At the inn, where the old woman in red keeps walking back and forth, you can go between the two buildings. Walk to the end of that tiny path and use the confirm button (the one that opens chests and such) and you'll grab it. It's quite the nifty little accessory.
There are actually 3 chests on the oasis board. one behind the green door in the upper right and then 2 hidden in the top left corner and one in the bottom right corner on the sand. The armor is a bronze dress and im pretty sure that is where I found it. But maybe I am wrong.