I don't think he owns that prop. its likely in some collectors hands. people spend a lot of time replicating movie props, its an industry unto itself.
while ilm does "kitbash" many props from real world items, this one not based on a real keypad of any kind that I know of. its a hero item that would have been based on art department sketches. if you think it is a real keypad, show me some pictures of one that matches.
that aside, its absolutely not die cast as the back of it you can clearly see is machined out by hand on a manual mill.