Where can I find Filter sleeves in Hürtgenwald?

Filter sleeves can also be found in these cities:

Aachen Alsdorf Düren Eschweiler Kreuzau Langerwehe Mechernich Monschau Nideggen Niederzier Nörvenich Stolberg Vettweiß Zülpich

You can also find this in Hürtgenwald:

Cheese Particle Lemon Aroma Jam Ice Cream To Portion Poultry Still Water Coffee Pods Poppy Seed Roll Canned Fruit