My mother used to run a daycare and she'd do something similar when someone came to inspect the school to make sure it was okay for kids. She'd leave something small (slightly overflowing wastebasket, some loose toys in a hallway) that the inspector would notice in the first few minutes of the inspection. She found that if they got to mark her down for one or two small things quickly they were less likely to go looking for something later and drum up a serious offense from nothing just to have something to write down.