Remember this old adage?
"See a penny, pick it up, and all day long you'll have good luck?"
Well not any more.
http://www.bbc.co.uk/news/uk-england-39130530
I should now be, "See any money, don't pick it up, or you'll end up in the dock."
This is a waste of time an a joke, I'm sorry but if you can't look after it it's your loss.
I myself was in London Stratford shopping centre I bought a need Parmesan Pretzel and put the change from a £20 in my pocket.
A short while later it wasn't in my pocket, I didn't lose ant sleep over it, and thought "well I hope the person who found it need it or put it to good use."