That is a bummer, hope you get some good finds next time!
My parents are both very into coins. Every week she asks the local bank for 50cent pieces and Eisenhower dollars. We also save all small face bills for my mom since she likes to collect them. I found a silver certificate $20 bill once at work. I had switched it out for another $20 since it was lime green on one side and looked cool. Come to find out it was worth about $250 and that was close to 10 years ago now!