The Tin of Sardines is a historical item which can be found by Emile in Neuville-Saint-Vaast during Chapter 1.
Location[]
Inside the room marked with cogs where you find the lever, this item is on the floor to your right.
Description[]
"Soldiers were all fed by their respective armies but they also received parcels from back home to improve their daily lot. Tins of fish or pâté gave them a more copious nutritional meal than their daily army fare."