The packaging of the biscuits of the Hanoverian company Bahlsen (the same one that produces Leibniz) produced in wartime.
The packaging has an interesting lid locking system.
On the ends there is an inscription:
""Verkauf nur gegen Rückgabe einer leeren Packung für die Altmaterial-Sammlung", which translates as:
"Sold only on condition of returning an empty package to the recycling point", which is logical in order to save money in German industry during the war.
Inside the package are 15 authentic cookies with the inscription BUTTERKEKS