If you look on the V5 it should provide you with the number the DVLA expect so you can check.
In the engine bay, on the firewall in front of the drivers feet, near the metal fuse/smarts box you will see the car chassis plate which has the same number stamped on it.
![[Linked Image]](https://www.tm-img.com/images/2022/08/22/SerialNumberFirewall.jpg)