I have an RCD310 for sale - removed from a 2012 vehicle for RNS upgrade - it has the blue backlighting.

$50 pickup in Melbourne near airport. As is - I don't have a code card - not even sure if it has a code or not.

NOTE: I asked my local VW dealer about a code and they said it doesn't have one (??)
I am not sure if this is true or not. If the radio does in fact have a code there is a guy in Box Hill who can send it from the serial number for $20-$30 (see on ebay)