Thats what I was thinking, you should ask both owners what happened to the original license plates. Hopefully my original owners wife could locate mine.
I am trying to plan a similar trip to the original owners wife and son (owner passed thats why the car got sold). The original owner cherished the car, kept every piece of paperwork, other than a possible window sticker.
I was amazed at the level of preservation all the documents were in as well as the car.