Just purchased a Honda Model # HRR169vka. Can someone tell me why on my registration form that came in the owner's manual, the first part of the serial number is already typed in and you complete the rest, it is MZBZ. This is incorrect it is actually MZCG(This is part of the number on the mower). Is this a old registration form or do I have a lawn mower that don't match? Just concerned that maybe this is a rebuilt mower or a old one that has set in a warehouse for a while. Hope I made it clear what I'm asking.