Replaced front shock bushings today. All went well until I was all done, everything back together and then I find a shim on the floor. I have no idea which side it came from so I have no idea where to put it. It's very thin, about as thin as a piece of paper. Should I be concerned or just forget about it? I took a test ride and all seems fine.

Thanks for the replies. The illustration from rothwell really helped me find the right place for the stray shim. I thought each car was shimed differently