The only way that your car is going to be stolen is with a flatbed. Your alarm wouldnt do anything to prevent that.
They did have a few stolen cars with dummy fobs in Europe, I think. If its not in the states yet, probably will be soon.....
1997 328i- retired
2007 328i- retired- lease
2006 330xi- retired
2013 M3-Laguna Seca-6 speed-EDC
2006 X5- retired
2011 X5- retired- buy back