How did they know it was 49-state legal since you have a green sticker? Do these get a special placard, or are they looking extra close at VIN's now? I would think you should be good to go either way during red sticker season, and that may be why they let you in at Prairie City. I'd call them up before making the trip. (831) 637-8186
Let us know if Hollister was worth the drive. I'm getting pretty burnt out on Prairie City and all the baby head-sized rocks.