2004 Keyless Entry

I have read some of the other threads. I did not see this one. I just bought a 2004 Grand Prix. I was told from the dealer that keyless entry was not an option purchased for this vehicle. He called GM and they sent him the sheet for the vehicle. I am confused to see a small dome on the dash that looks like it is the reciever for keyless. Any advice for this??????????

Find a new dealership, that guy is an idiot. I have keyless entry, I even got 2 remotes when I bought the car, even though it was used. However, you would have to get it programmed by the dealer.