My son works for Walmart now.
It is a part of his duty to "clean up" all the junk left behind, corral the forgotten carts, report any safety issues like lighting, bent barricades, stolen signs, etc.
People actually steal the signs from a Walmart parking lot, especially the Handicap Parking signs. WTF!?!
Those signs are right there under the bright lights and it takes special tools to remove them!
Of course, to some a "Sawzall" IS a special tool.