It happened once, when we got a pretty rare movie. There simply weren't any copies nearby. The reason I think they don't skip over that movie to the next available one is because it would mean they'd have to keep skipping it forever if it was a rare movie that no one near your distribution center ever rents. Whether you get it now or a year from now it would still have to come from far away, so might as well do it now. With more popular movies, I'm not sure why.