You shouldn't blame the store for your mistake, or expect them to somehow make it right with you. The only hope you have is that some very honest person found the money and will turn it in to the store. You should check back with the store. Good luck.
Every time you leave a place, make sure you have everything with you. the manager cannot do anything about this. You should just tell your mom and just explain to her that you forgot your money at jcpenny. hopefully she will understand.
Tell your mom, but don't expect anything to happen. It's gone.
You don't get it. Someone has stolen it. Nothing the Manager can do.