There's many different leveled lists for raiders depending on what is being distributed, weapon, ammo, armor, misc object, food etc, so you need to put it in the right one(s). Chance None is the percentage of a chance the game has to not choose an item marked so. You can use chance none on the list itself or individual items within the list. [0006D4B9] Conatiner_Loot_Cabinet_Garage <--- this LL has good examples of using chance none. If you want to make certain that an item spawns on an npc via leveled lists, do not use chance none. Using FO4Edit can make this very simple.