i totally agree with you, if there is no sign saying the customer is not allow to keep the breads in the cart for more than a certain time, that means the customer have the right to keep the buns in the cart as long as the customer is still inside the supermarket. If that lady was willing to spend 30mins staying inside the supermarket just to buy the buns she wanted in a discount price, why not? no one can say she was doing something wrong unless there is a SIGN.