Left on the desk in their room with Fang no where to be found. (Hint, she's hiding like a wuss.)
On Yevontide, during some down time they had (I'm assuming they had some plans that day with people), an envelope is set balancing on top of a small box. Initially, you wouldn't even see the box with how the plain white letter sized envelope is angled. The front of the envelope simply has Vanille's name written on it in Fang's rough scrawl of hand writing. Inside of the envelope on a plain white sheet of paper the following is written, in that same familiar hand writing:
( Vanille, )
( Vanille, )