收到USPS alert, book outlet 的书貌似寄丢了

收到以下message. 有啥办法可以找回包裹吗？还是彻底就丢了没办法了？一个多星期前下的单。
Your item could not be delivered or returned to the sender. It is being forwarded to a USPS mail recovery center where it will be processed.