I done same thing on a Christen Eagle and found that the current owner had changed the CAA number. May be that the early numbers were not logged only the current. Check out [link=http://www.aerovintage.com/faareg2.htm]http://www.aerovintage.com/faareg2.htm[/link]
NC86 ~ N4611N, NC87 ~ NC87E, NC88 ~ NC88H, NC89 ~ NC89H


Cheers.