Remove a door lock and send me the code. I will be glad to make a key and send it to you.
If the car is to be sold, as stated in your original post, I would not do anything to get it running. Let the new owner do all that stuff, his way. I bought a car that had been stored for 60 years and the tires aired up enough to move it from the New York barn. It would be nice to know that the engine will turn, but other than that, I would leave it alone. If the car looks as good as you describe, that will sell it. The one thing you can do to make the car bring its fair value is to get a good title for it.

Mike