Sirius Radio Activation
Your sales associate should have activated the radio by calling Sirius for you and setting it up at delivery of the vehicle. He or she should be willing to do it for you now. It typically takes a cell phone call of a few minutes (depends how busy Sirius is at the time). You will need the car there at the time. Once Sirius has the data it needs, an activation signal is sent to the car, and that's it (usually).
Perhaps the last 7 numbers of the VIN may help, though I'm not sure of that.
Hope it works out...