There are actually two codes; one for the radio (in the document wallet on a new car), and one for key programming (not normally released to the first owner). Neither is needed in normal use. The
radio code is also stored in the car's firmware (so survives if power is lost, as when changing a battery); the keycode is only needed to program replacement keys.
If by any chance you do need the
radio code, you can get it here on this forum in return for a modest
donation, but you'll need to take the radio out to read the serial number. As others have said, if you do need the keycode, either a main dealer or a competent locksmith can provide it, but both will likely charge for this.
If you don't need either of these right now, don't worry about it.