It's wrong to steal other people's stuff.
Lee is in the locker room at the tennis club and notices that someone has two tennis rackets in their open locker.
Lee needs a tennis racket, so he can play that afternoon.
Lee finds the owner of the locker and asks permission to borrow the racket, which is granted.
Making no effort to find the owner, Lee takes a tennis racket from the open locker and uses it on the court.
Lee plays tennis, and then returns the racket to the owner.
Lee gets caught by the racket's owner and is reported to the club management.