You definately should have reported it. Wanting to salvage your shotgun season is a pretty selfish reason. Assuming that it does have the disease, it has the opportunity to infect other animals. What sort of season do you think you'll have next year. The DNR would have taken caution and pursued this right away, probably having it out of the way before they could disturb shot gun season.

That is a part of being an ethical hunter. Usually with CWD they are also not afraid of human contact. It sure does sound like that is what it was. Wish you would have reported it.