I live in Gunnison. Really sorry to hear this.
Was just swapping stories with other guys at our local gun club about members who had inadvertently left a gun at the range and we got it back to them. In my own case, pulled into the empty parking lot of my local gun club. Noticed a nice metal pistol case just sitting there. Had three very expensive pistols in there. Took the case home with me and posted my name and contact info. on club bulletin board. A couple of days later got a call from an older gentleman who was very relieved to learn that I had his guns. Had been loading up his truck, put the pistol case down, then loaded up some other stuff. Hadn't noticed the case was still on the ground and drove off.
I assume this was at a public range.