A set of cardboard field post (Feldpost) boxes, each with a printed label reading "Abjender:" (Absender), "Feldpost," "An," and "Feldpostnummer:" fields for sender, recipient, and field post number. The boxes are of the small rectangular type used for parcels sent through the German military postal system. A small printed reference number appears in the lower left corner of each label. Feldpost boxes such as these were standard issue for packages mailed to and from soldiers at the front, allowing censors and postal handlers to route items using the sender's field post number rather than a specific unit location, for security reasons. The Feldpostnummer system was introduced by the Wehrmacht to conceal the location and identity of military units from enemy intelligence while still allowing mail to be routed correctly between soldiers and their families. Each number corresponded to a specific unit or sub-unit and could be reassigned as forces moved, with central postal authorities maintaining the confidential key linking numbers to formations. These parcel boxes reflect the everyday logistics of maintaining morale and family contact across the German armed forces during the war, a system that handled many millions of items annually between the home front and combat zones.