Just wondering..Possibly a dealer converted Fire Chief car?.

I was wondering and since my Fury has this siren installed that looks to be Factory or Dealer installed and the cars color is factory red, could this be a Fire Chiefs car? The tag doesn't have the right code for this option (if it was an option) so could this have be converted to a Fire Chiefs car and if so is there anyway of finding out? This siren just has me puzzled, because it looks like it was a dealer installed item and it works. Not sure though. What do you guys think?
Author: 66sportfury