1. Check your old vehicle registration documents: If you have any old vehicle registration documents, they will likely contain the VIN (Vehicle Identification Number) of the vehicle. You can use the VIN to search for the vehicle's current registration information, which may include the current plate number.
2. Contact the Department of Motor Vehicles (DMV): You can contact the DMV in the state where you previously registered the vehicle and provide them with your name, address, and other personal information to inquire about any vehicles that may have been registered to you in the past.
3. Use a vehicle history report service: There are several online vehicle history report services that allow you to search for a vehicle by its VIN or other identifying information. These reports may include information about the vehicle's current registration status and previous owners.
4. Search online car listings: You can search online car listing websites for vehicles that match the make, model, and year of your old car. Some websites allow you to narrow your search by location and price range.
5. Check with your insurance company: If you have previously insured the vehicle, you can contact your insurance company to see if they have a record of the vehicle's plate number.
Please note that some of these methods may require a fee or may not provide complete or up-to-date information. If you are unable to find the information you need through these methods, you may want to consider contacting a private investigator or a professional car search service to assist you in your search.
