I've got several YourPlus Abus locks (all keyed the same) so that I can have one key for basically all the family bikes. The other day I noticed that one of my D-Locks had a plastic part missing, namely where the Abus logo is usually placed. Behind where the logo once was you see the solid metal of the meat of the lock. There is a 7 digit number there.
As it's trivially easy to get a fifty dollar lock keyed to the same yourplus code as mine (if you know my code) and then steal my bike, I'm hoping someone can help me sleep better at night by telling me that it's in no way related to the bitting values of the lock.
Lock in question is the Granit 640.
Yes, I've contacted the manufacturer asking the same question but haven't heard back yet.
As per question, I had e-mailed the manufacturer (Abus) regarding the meaning of the number. Apparently it is the serial number of the item (bike lock) itself. Also Per e-mail from the manufacturer,
"Due to security reasons it is not possible to order spare keys with this number".
On each YourPlus key card is the YourPlus code for your key/lock as well as the lock's serial number. I'm not sure if Abus partners would be able to request a new key for serial number x (perhaps a thief working at a key shop) or look up yourplus codes for specific serial numbered locks, though I highly doubt the latter.