An airplanes tail number stays with the plane throughout its existence, unless maybe it is transferred out of the country. The Shelby liveried DC3 / C47 should be traceable by its tail number. I was able to locate my Grandfathers WACO F2, bought new by my Great Grandmother in 1931 to its present owner, it still carried the same tail number even though it started on the east coast and ended up on the west coast.