What happened when the courier was returned by Mars?

Express delivery will not be returned without reason. What happened is as follows. If the user can't contact the phone for 3 to 7 days, it means that the user has not contacted the courier company and the delivery address has not been received. The courier company delivered more than two times, and the third delivery time of the courier could not be determined. The courier company can apply for a return. In other words, unsigned packages generally return by the original road if they can't be contacted in a week or so. If there are special requirements, it can be decided according to the wishes of the consignee or consignor.