A more generous quote of GP comment provides the answer: > provided you report it to the authorities and nobody claims it in some time frame One would expect

A more generous quote of GP comment provides the answer: > provided you report it to the authorities and nobody claims it in some time frame One would expect that "report it to the authorities" covers that problem. The authorities will take care of either contacting the shipping company and letting them know, instructing you on how to do it yourself, or even take possession of the package to return it themselves.