It's actually slightly more than that - I went back to make sure I wasn't going mad. XD
There are two chests at 6,11 one of which is the one listed, the other seems to be giving out aetherial gear, I got Aetherial Fingerless Raptorskin Gloves the first time I ran through and Aetherial Boarskin Ringbands of Flames the second time, neither of which are listed as possible drops here (and neither have an acquisition method listed on their item pages).