what's up with this door tag?

[12bolt]

[ QUOTE ]
"NOT FOR TITLE OR REGISTRATION"

Is that unusual to state this in regard to the VIN on this plate?

[/ QUOTE ]although that is on all the FORD door tags, I never understood why. assumption would have one believe that due to the probability of cars ending up in junkyards, Most people never bothered to change that Door Tag when they R&R'ed the doors. as a kid at the Dealership, My task on Saturdays was to retrieve Keys from the night drop and assign Mirror tag and Key numbers and write all the information from those Warranty Plates. I have seen many but this one is odd for certain to me. other than the fact that it was probably a Test mule I am drawing a Blank.