Let me guess - it's a 2005 model year bike (CBR 600RR), right ?
Sometimes you will see a number (example - for the Fireblade/CBR 954RR - "954rr2" or "954rr3" ) attached to the end of model year designations online or in print (or on vehicle titles with a DMV office, which sounds like what you ran into).
Anyways, the above "rr2" for the cbr954rr example would equate to a 2002 model year bike and the "rr3" designation would equate to a 2003 model year bike. I'm guessing the "rr5" for your bike just denotes it was a 2005 model year bike...hope this works and
i can finally get rid of man boobs and that sheds some more light on the matter.