Property brought to the camp by the prisoners was systematically looted, an operation for which more than thirty warehouses were set aside in a special compound within the camp, known by the prisoners as 'Canada'. Höss's memoirs record that prisoners worked day and night to sort the booty. Freight cars were loaded every day for shipment back into the Reich - generally between five and ten, and sometimes as many as twenty - but heaps of baggage still remained to be sorted.