[Alas]

who took possession of the weapon from a hunter who found it January 26 while hunting coyotes in the hills above Wallsburg.

This is a hunter with a screw loose, a fifty story building wit a two story elevator. He found a fifty and turned it over to the police? Gotta be nuts.

[Redbob]

"He found a fifty and turned it over to the police? Gotta be nuts."

Alternate explanation 'A':
Huntered feared he was being watched or followed when he found it.
By Arabs?
By Utah SState Police?
I'd have turned it in too!