Abstract: A package receiving and returning device for fitting to a sloping roof/building. The device has a storage cavity with an opening, a frame bounding the opening and a displaceable cover arranged in the frame which displaces from a closed first position wherein the opening is sealed thereby preventing access to the storage cavity, to an open second position which permits access to the storage cavity. A sensor detects presence of an unmanned aerial vehicle (UAV). A verification system verifies a designated UAV for a requested delivery or collection. An automated mechanism displaces the cover between the first and second positions when activated upon detection of the verified UAV to allow a payload to be delivered into, or retrieved from, the storage cavity. The automated mechanism positions the cover to define an entrance that corresponds to the features of the UAV and/or a payload to be received/returned, and/or environmental conditions.