I would say just finding that many was a great feat. Returning that many is phenomenal. Very commendable of you to do that. I hope it gives you great comfort for making so many people happy to get their keepsakes back.
Hey Uppermi, Carrotjuice is 100% correct in praising you for returning all those class rings! About 30 yrs ago I lost my class ring surfing in a contest in Ocean City, Maryland. I was really bummed out, but eventually forgot about it. About 5 yrs later, my high school called my house to inform me I had a small package at their office. You guessed it! It was my ring. The person who found it never even sent a note with it telling who he was and no return address to thank him.