A New Idea
The neighbor talked to Russell and explained to him that his plan is not going to work well nor is it going to change anything. Russell realized that the neighbor was right and he needed a new plan, something that is more effective but still harmless.
He decided to place a balloon inside the box filled with glitter. When a thief opens the box, the balloon will explode and the thief will be covered with glitter. The thief will look like a clown after all of this and he will probably think twice before he steals another package.