亚马逊包裹被退回（Unclaimed/Max Hold Time Expired），接下来怎么做？

客人在9月中旬下单，昨天说要换货，想回他信息，却发送失败：”We were unable to send some of the messages below to your customers because emails to their email addresses were bounced by their email service providers.”
看了下tracking，说包裹未妥投：”Notice Left (No Secure Location Available)”（1个月前）；无人认领，超过时间：”Unclaimed/Max Hold Time Expired”，然后快递就退给我了。
接下来要怎样？要收restocking fee么？