Darn!, good finds there! One wonders how large items like those DWs can be just stashed away for about half a century, brand new, without being noticed and "disposed of" in a building renovation or something.
I'll bet your Apex DW racks will clean up nicely; that looks like surface rust, which might be scoured off with fine steel wool. Question is, would the rust recur if the machine is used, even if steps are taken to assure the racks dry out fast?