Oh no based on that photo, it looks like not only did they steel one of the exhausts but they also stole 2 cylinders.
Sorry couldn't help my self.
If your undertray looks like that, then you have a 6 cylinder engine and those only have the 1 exhaust pipe. Only the v8's have the dual exhausts.
The cat sections is the silver/shiny bit going up.
So if your under sides look like that, your fine. Nothing was stolen.