this reminds me of something that happened to my brother once. he was walking out of a grocery store and found a small change purse containing a few hundred dollars, and no i.d..
he didn't even think twice about going into the store and informing the manager of what he had found, and turned in the money with his name and our phone number.
i remember giving him a hard time about it, but all he said was what if it was someone's that really needed it. he couldn't enjoy the money thinking that someone else might be suffering for the loss.
later that afternoon, an old woman called to thank him. she was poor and very ill, and that was all of the money she had to buy groceries and medicine for the month. because of her infirmity, she was only able to make it to the store about once a month, so she would save up for the trip.
there's no big moral here. my brother never won the lottery, or recieved a big reward for something. but his conscience was clear, his karma intact, and he felt pretty good for doing the right thing. that's worth more than a few hundred bucks, imo.
A true lover of nature does not despair now that his mistress has turned a colder cheek.