There's been nothing ever since they nerfed Astral Rings in Oztroja. That and when they changed how chests pop for AF and the "nothing but a mirage"/1 hour wait when you open one now.
If you're really gunning for opening chests, try the Fields/Grounds of Valor ones, they have some nice R/E drops, such as crafting torques with +2 to the craft in them and an assortment of other cool stuff.
http://wiki.ffxiclopedia.org/wiki/Treasure_Casket
There's a list of the items you can obtain.