All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
The view that we adopt here in Islamweb is that it is permissible to work for organizations whose activities are permissible in principle but may include what is forbidden, provided the employee is not directly involved in the forbidden activity and his work does not involve aiding that forbidden activity in any manner.
Therefore, it is permissible for your friend to work as a package handler in this company on condition that he does not carry goods that he knows or has probable cause to believe that they are forbidden, like alcohol and the like.
Allaah Knows best.