I found one once.
First thought was- darn, now I have to try to locate the owner. It Had likely been there for years.
Put up some notes, & posted but after a google search turned up MANY stories of lost wedding rings (some had lost two or three), I didn't worry about it so much.
Been married for 18 years and lost my wedding ring at the water slides back in 05. Never bothered to get a new one. Lucky for me I was freshly lubed up with sunscreen and it slipped right off. Would have sucked to lose the ring and a finger.
The ring is engraved , s+k 1974. I will check with the park and chuck it back in next time I am in the valley if there are no claims.