Harold
The door lock and ignition switch use the same key. A second key is used for the box lock.
I am unaware of a code number stamped on the locks. But, from the factory and when new there would have been a number stamped on the key on a small removable tab attached to the key. Those tabs would have been removed by the new owner or upon delivery by the dealer. That number would have been or was recommended to have been recorded for future reference as needed.
A locksmith might have a ring of keys, or know of someone that might have such, that should be able to help?