Ironically aftermarket refurbished RNS510 units are written on a card.

Whereas stock units do not come with this card (for security reasons) and all too often not provided by stealer who just assume new owners will never need the code, cause they think they know jack ***** about the units (like them) to ever need to pull them out and sell them to fund their aftermarket RNS510 upgrade!

My advice to all people is to ask for the 4 digit code as part of taking delivery of the vehicle, cause there's no extra incentive for stealer to look it up on their system and write it down for you!