As you probably know, the latest update added an NPC that can hold your event-related items. From the update details:
"A new option allowing adventurers to store equipment and furnishings obtained from special events has been introduced. Conditions are as follows:
-Special equipment and furnishings of both normal and high quality may be stored. It is not possible to trade several of these items at once, however.
-A key item for proof of storage will not be provided for stored special event items. It is possible to check which items have been stored by speaking with the NPC.
-A fee of 500 gil must be paid to retrieve stored items.
-Enchanted items will be set to the maximum recast time when retrieved from storage.
-Enchanted items with a limited number of uses cannot be stored.
-Only yukata specific to the character’s gender can be stored."
According to the above limitations, there are several items that should be able to be stored, but cannot. They are as follows:
Bronze Moogle Belt
Silver Moogle Belt
Gold Moogle Belt
Rabbit Belt
Mandragora Belt
Worm Belt
Red Sash
Dash Sash
Fortune Egg
Happy Egg
I have submitted this list to Square-Enix via the Comments & Suggestions e-mail form, and requested that the Event Storage NPC be updated to accept these items. If you are of a similar opinion, please submit a request to Square-Enix by browsing to https://secure.playonline.com/supportus/exmf.html and selecting "Comments & Suggestions".