A crate with a paper inventory label on the inside of the lid describing its contents as "Chi. Maschine", likely an abbreviation of 'Chiffriermaschine' (cipher machine). The internal dimensions of the box match the dimensions of an Enigma machine (in a wooden transport case). On the label, there is a quantity column specifying that it is one of 50. According to the label, the crate was sent to field post number L31002, the 2nd Batterie Flak-Abteilung 506 (a heavy anti-aircraft battalion). On the label, there is also a round ink stamp with the German eagle in the middle that has another Dienststelle Feldpostnummer (with 'E' prefix that identifies a receiving/sorting unit) for that battalion.