There are lots of different model configurations that manufacturers will use the same case for. If your particular configuration didn't include a dvd drive, they would just put a drive blank in to fill the space.
All of the configurations that I found included a dvd drive, but they do different things for different national markets. I'll do some more checking, but one way you could positively verify it is by pulling the bay cover. There should be three or four small screws on the bottom of the case securing it in place - you could pull it out and see what, if anything is in it.