The euphemism is "shrinkage" and includes opened drink containers and candy/food wrappers/boxes left by unsupervised children roaming the store.
The Wal-Mart in my town has them simply loading flat-screen TVs into carts and walking out; when they stop them they make a scene (but get locked up anyway).
The store was built in the meadowlands where contamination probably ruled out building housing; they are far from the residential area.