Abstract: The present invention relates to a box, particularly a mailbox which includes a lid, detecting and indicating elements for detecting and indicating the presence of one or more objects, such as letters and newspapers. The detecting elements include a pivotally mounted member (30) which is coupled to the lid (7) of the box, via a transmission (60-67), for moving the pivotally mounted member (30) from an initial position in response to the opening of the lid (7). The pivotally mounted member (30) is arranged to automatically return to its initial position as the lid (7) is closed, if no object is present in the box. If an object is present in the box, the pivotally mounted member (30) is prevented from returning to its initial position, in which position the pivotally mounted member (30) is so arranged and positioned that it activates an indicating member.