Yeah, they're very recent. Lots of signing projects in the Vegas area, a few of which will have implications for this site.
I'll make the change now, but I expect they'll be adding more exit numbers in the near future. I'll be down there next month and will be able to field check. My guess would be 4, 5A, 5B, 6 for the others, but who knows with NDOT and it's not like they're strictly following mileage here, so I won't count chickens before they hatch.