When you refuse a parcel or piece of mail from the United States Postal Service, the package is returned to the sender. Return-to-sender usually involves a two-week wait (at the very least) at the postal service for the refused mail, which is conducted in case someone arrives to claim it and it was refused to owe to an inaccurately written address or something similar. If no one comes forward to collect the refused piece of mail following two weeks, the post office reloads it onto a van and sends it back to the return address on the package.