You did the right thing...
Something similar happened to me. Two days ago, I removed my wedding band at the gym because I was deadlifting (midget weight for the getbig millionaires around here but pretty heavy for me). My fingers were hurting and preventing me from grabbing the bar properly.
In any case, I took off to the rowing machine and completely forgot about it. I called the gym back when I got home but the trainer couldn't find it...
Long story short, the next day, the guy at the counter said someone brought it back to him... You have no idea how "right" the world felt that day. I asked around and it turns out it was one of the trainer there, biggest mofo I've ever seen in my life, never speaks to anyone and lookds badass. Today, I knew he was working so I gave him an envelope with 100$ and a voucher for a high end restaurant where I live...
I don't believe in karma or anything but I've always treated people right and I think somehow it came back... That ring was my father's... It has immense value.
So, Groink, thanks for doing the right thing!