After getting the quest from the metaphysician and doing it, getting the charm and right clicking it...* takes a breath *...and finding the locations on Ariberths guide you might find one of these items! Enjoy!
Well some of the variety of things that I know come out of these chests are:
Wongzo Grape (Used to heal hp and sp/feed your pet so you can be lazy) =P
Plum Tome (no idea what this is used for)
Gold (thus far I've only received 1G)
Exp (high (e.g.) 33k exp and low amounts (e.g.) 300 exp)
Treasure Urn (this is what you get your esper accessories from take to tonni if you want accessories)
Treasure Bowl (this is what you get your mediums from take to tonni in sunstream to get them if you want)
Dragon Best Skins (this can be used to make a ying-yang flag for lvl 15 espers)
Talismans of craft (usually comes in 5's to + ethernal and celestial armor you get from donating to your faction)
Sometimes you can get an accessory for espers
Sometimes you can get a mixture of like (e.g.) a treasure bowl and exp
10 refinery talismans (BOOO!)
1 refinery talisman (doesn't make up for how much you spent)
GILHOOK! <<<You have a possibility of releasing these and look on a guide for gilhook locations!
Worst of all...................you can get nothing!!
Anything else be sure to let me know so I can update this! I'm not 100% sure I got everything!