Quests whose objectives are not in the database are usually new quests, most notably seasonal quests.
I'd imagine that, with Cataclysm looming over our heads and hitting the shelves in just a month or two, the developers of Carbonite are more interested in making the next version compatible with Cataclysm than adding a few stray seasonal quests. As such, I'd recommend you to either look at the quest text and figure it out from there, or use Blizzard's own quest guide for those quests.
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