Treasure Casket

Treasure Casket After defeating foes in any of the original outdoor Final Fantasy XI zones, there is a 10% chance that a Treasure Casket will appear. Depending on their fortunes, adventurers may encounter either unlocked Treasure Caskets (blue) or locked ones (brown). Unlocked caskets will open readily, allowing treasure hunters to immediately get their hands on the desired loot. You can have regular treasure rewards from the mob and have a treasure casket appear, as treasure caskets are independent of normal treasure.

Finding a Treasure Casket
After defeating mobs in any of the following zones, there is a 10% chance that a Treasure Casket will appear (this is not affected by the Treasure Hunter job trait):


 * West Ronfaure / East Ronfaure / La Theine Plateau / Valkurm Dunes / Jugner Forest / Batallia Downs / North Gustaberg / South Gustaberg / Konschtat Highlands / Pashhow Marshlands / Rolanberry Fields / Xarcabard / Beaucedine Glacier / West Sarutabaruta / East Sarutabaruta / Tahrongi Canyon / Buburimu Peninsula / Meriphataud Mountains / Sauromugue Champaign / Qufim Island / Behemoth's Dominion

Opening a Treasure Casket
Treasure caskets can be opened by members of the party of the player that defeated the mob, or will automatically disappear if left unattended for three minutes.

Unlocked (blue) caskets open readily, however, players attempting to open locked (brown) caskets will be prompted to enter a two-digit code between 10 and 99. When attempting to open one of these caskets, you can "examine the lock" in order to gain a hint about the code, or try and guess the code; both options will expend an "attempt".
 * You are given between four and eight attempts to guess the combination.
 * If you fail in one attempt, a hint will be given to point you in the right direction (either higher or lower).
 * Thieves can use tools to gain a free hint, without expending one of their attempts.
 * Multiple tools may be used, however there is a low rate of success after the first.
 * The hints are not necessarily correct descriptions of the code, but have a high degree of accuracy.
 * After several examinations, you may receive the message that "you are unable to glean anything from your examination of the lock.

For example, when attempting to open a brown casket:
 * Examine Lock: "You have a hunch that the first digit is even." (5 attempts left)
 * Examine Lock: "You have a hunch that the combination is greater than 15 and less than 35." (4 attempts left)
 * Examine Lock: "You have a hunch that one of the two digits is 2." (3 attempts left)
 * Examine Lock: "You have a hunch that the second digit is 6, 7, or 8." (2 attempts left -- combination is 26, 27, or 28)
 * Tried entering 26, and the chest opened. (Note: In a situation where you know the combination is limited to three options and have 2 attempts left, it is best to start with the middle possibility as the initial guess.  This provides that if you guess incorrectly, the resulting message will indicate whether the correct combination is the higher or lower number.)


 * See also: Casket Cracking 101 by Headache, Cracking the treasure casket code by Pikachuninetail

Rewards
Rewards from Treasure Caskets are not placed into the treasure pool, but can be retrieved by examining the casket and selecting the item to remove from it.

Blue caskets contain an assortment of temporary items to assist you in your battles, these temporary items carry the same properties and restrictions as temporary items obtained in other events.
 * A blue casket may contain several of the same item, but this does not enable a single player to retrieve more than one.
 * It is possible to have multiple caskets open at the same time, belonging to the same party.

Brown locked caskets house a variety of equipment and items, and for the most fortunate adventurers, even exclusive equipment not to be found elsewhere. Each zone containing treasure caskets has one item exclusive to caskets in that zone:

More information on the rewards from each zone can be found on the following pages: