Are you messing with me?  My opinion would be to not take it.   Why on earth would you take money that is not yours?   I would take it to charity to help an animal find a home or help someone in need, because isn’t that what God would want you to do?  I know I could never live with myself if I had kept it and spent it.  I would  be so very guilty.   Though it would be nice, and you could use it for so many things.  I  am sure God would be upset as well as the person who lost it!  I mean sure it is not everyday you just find a huge wad of cash just lying around on the street.   What would you do if you lost money like that somewhere and you went back to go ask cashier or someone, and they say,” I am sorry, no one has turned it in or notified me about it!”.   I bet you and/or I would be pretty upset. But my point is, don’t keep it and do the right thing, that’s what God would like. That is what I would do!!