Your old plate has been cancelled. It does not have to be turned in, but you should destroy it.
When I get my special/personalized plate, what do I do with my old license plate?
Louisiana Driver Reinstatement Status
If you've been notified of a "flag" on your driver's license for lapsed insurance or other reasons, you may need to have your license reinstated by the Louisiana Office of Motor Vehicles. You can check your driver's license status at the Louisiana Express Lane website.
