Do you mean you can't find the character you exported to the Character Vault? Or do you mean the actual character sheet? Character Sheets are a configuration of a Game. The data on the Character object corresponds to a given sheet, but it can't be interpreted outside the context of a Game currently. Character Vault is only intended for moving characters between Games. External viewing of Characters is a much requested feature, and if that's what you're after, you should be able to find a Suggestion in the Suggestions Forum that addresses it.