I would mark gps locations, and take lots of pictures to make sure everything makes absolute sense to any outside eyes. If you think the animal is fatally wounded and will die soon maybe give it a bit longer than normal and go in for recovery. I think the best person to answer this would be a warden… but it may vary from warden to warden. Same question could be asked of spots that border RMNP or preserves in other parts of the state that you can’t hunt.
There is no retrieving game from a NP, they don't care where the shot occured. You hunt the border with a rifle, you better anchor it on the legal side of the border. You shoot it with a bow, you better be far enough from the border that he can't make it across.
As far as unit boundaries go, I'd mark the shot location on OnX and go recover the bull. I also wouldn't worry about making phone calls to anyone.
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