There are two types of key:
Classic is black, single button on the edge. No remote boot.
Johhny-come-lately is blue, two buttons on the face, and remote boot release.
They key needs to be ordered from Maserati.
(All from memory, but pretty sure it's right. It's all in the manual)
The red card contains the mechnical details for the blade of the key, so a key from another car won't turn your locks.
You *should* have a silver card which has the emergency immobiliser bypass process.
In theory you could get your new key, unlock the car with it and then unlock the steering. Go through the emergency bypass and start and drive it to the dealer (although your alarm will be going off I suspect)
The dealer can then code the new immobiliser transponder chip to the car's ECU.
I wonder how they will make it work the central locking as that's normally done by putting the alarm into learning mode by using the existing key....
C