People stealing stuff it gun ranges is nothing new... happened to me.
Years ago, about three decades, I worked at a local gun range... work as an RO. While technically we weren't allowed to shoot while we were working, it was common practice so long as it was slow and you didn't ignore your duties. So, one day I had my rifle with me and wanted to get some shooting time in ... a couple of shots here and there throughout the day.
The rifle stayed in the rack throughout the day, I felt pretty comfortable because I've been working there a little while and knew most of the shooters that came in. The day came and went and it's time to clean up.
So I go to the normal check on the Range, sweep the brass, clean the trash bring in the spotting scopes. There was one shooter left on the range hood got there late. Since there wasn't anybody else there we really didn't mind.
I just brought in 90% of the Scopes, couldn't bring in all of them because my hands were full. So I'm up in the club house and I look back and the guy is finished loading his car and takes off... I'll look out and my gun is gone. I proceeded to get in my car and try to find this guy but he was gone and nowhere to be found.
I know, 100% my fault. But this was in a time where you could actually trust your neighbor. The fucked-up part was this was a gun that my granddad built... He was a gunsmith when he retired. To top it off it was one of three guns that were left behind when my grandparents house was broken into. Dad was beyond pissed... until the day he died he never forgave me for this...fucked up part number 2... My half-brother stole and sold the other two guns.
The gun was a sporterized 03 Springfield. Beautiful Walnut stock, buffalo horn forend cap and pistol grip cap.
At least I still have the gun cabinet that Grandad made....