UNSOLVED WY - Johnson Co, near Healy Reservoir, WhtMale Skeletal, 25-35, gun found under body, Sep'15

I don't find any missing persons in WY that would line up, but found this one in CO.

https://www.findthemissing.org/en/cases/25536/6/

Sean Gribble was on work release from the Denver County Jail on May 20th 2014. He did not report back to the jail that day. He has been missing since that time. Family and friends reported Sean to be depressed and suicidal at the time. Neither family nor friends have heard from him since that day.
 
I don't see any updates for this case at all. I'm really confused because WY's most recent case in NamUs is from 1999... I'm sure there's been someone more recent than that (even if it's just this guy)
 

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