Actually, capitalization doesn't matter. I logged in a KoRaGi MyDnItE and had access to my characters. <.<
But there are plenty of other ways to accidentally subtly mess up the spelling of your login. Definitely recheck that! If you're absolutely certain, then log in again, make a new character and type"/s f_file show vault" and then "/s f_file show archive" in the chat box (without the quotes). They're unlikely to be there, but at least look.

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Login: The Copper Queen
Cromlech - The Best Copper This Side of Ruathym
Zelly Cys'dina - The Wounded Soul, Also Merchant
Aelynthi Nor'alei - The Bubbly Winged Elf
See me DM-side as:
[DM] Hlal | [DM] The Voice