If I am walking down an aisle in a supermarket and find $700 on the ground, what should I do?

Look around and see if there is anyone else in the aisle.  Ask them did they loose anything, but don't mention the amount.  If not, go to the service desk and tell them you found something, and if any one says they lost anything they should call you and leave your number.  If someone says they lost $700 then you should return it.