If I found just cash laying on the ground-I would keep it. I would not keep the blank check and if I found a wallet containing money, I would return it. I did find a wallet FULL of cash on the floor of a restaurant last year and called the owner and returned it. That's just my nature.
I do not believe in those money which came free. As free money will never give you satisfaction in your life. I saw many people who take the share of other money but their life become horrible.
Rite now I am feeling that I will return the money but do not know what will happen when I will found huge money. Its quite possible that I can change my decision. As now money can buy anything and give you a luxurious life.
No doubt everyone need money but who knows that money belongs to most needy person. So I am definitely go to search for the owner of that bag. But I never deposit that bad to any police station or somewhere else as now I do not have faith on them.