There's always such an odd little collection of things in a Lost and Found: a single mitten, a pair of sunglasses with one missing lens, a Beanie Baby, a lone key... I love it when I actually find something that belongs to me. It tells me that someone cared enough to pick up a wayward item, think that someone may miss it, and then take it to a safe place where the person may come looking for it.
Delivering something to the Lost and Found is a way of showing human kindness toward someone you've never even met and will likely never be able to thank you in person. I think that's pretty cool. So return something lost and find some good karma, friends.