story: Lou bought a newly constructed home. He already submitted a change of address form with the USPS. Lou checked his box everyday for a month and it was empty. He called the post office concerned and found that they had his mail. They weren't able to send it because his new address was new.
 selected sentence: Lou checked his box everyday for a month and it was empty.
Lou's mailbox is empty >Causes/Enables> Lou calls the post office