I have never requested an actual window sticker, can't answer that specifically, but you can go to any Ford dealership with the VIN and have an oasis report pulled with all the specifics on your build.
If the car was new and the sticker was misplaced, the dealer can get a new one. I don't know if you can if the car was used. Ask a dealer. That's the best way to find out if you can get one.