Restart your game for the changes to take effect. Enjoy a Theft-Free Simming Experience
has a set of "Internal Tweaks" that address autonomous behaviors. Their mods are often hosted on sims 4 stop stealing mod exclusive
Some mods add objects directly to a Sim's inventory via scripting (like reward boxes). If a Sim steals a box that contains your exclusive item, the mod protection does not trigger because the item technically doesn't exist on the lot yet. Open reward boxes immediately or use bb.moveobjects to place the item physically on the ground before saving. Restart your game for the changes to take effect