I contacted the consignor, but since I knew he had worked at Warner Bros for many years, it was easy to guess at the answer, as you folks have. The consignor got them when the movie was being planned, because he thought they "looked interesting".
He only got the one set, and he is going to check with other people who worked there at that time to see if anyone else got these, but he doubts it.
I had a similar consignor a few years back who was the daughter of a man who had worked at Universal for many years, and he had a bunch of unusual design one-sheets on Universal movies that I had never seen before. I think they would make these prototypes and then choose a final version and only a few of these "rejected" styles survive.
Congratulations, Mark. I think you got something super-special, and I am glad they are staying together.
Bruce