First, open up the back and pull out the card, make sure it says 16GB on it. My wife's new droid X came with a 2GB card, my refurbed X came with a 16GB card. Guess who ended up with the 16GB card when we figured that out.
If it IS a 16GB card then I'm not the guy to answer that one.
I hope it works out for ya though.
-sttm