I've seen them walk the rows a few times writing down the license plate # of each and every car. It helps for those that can't find their cars.

I greatly dislike the picture taking that goes on entering/exiting the lots from the automated booths as those lights seems to be pointed more at the driver than the where the plate might be. The cashiers always rotated the camera as needed for the license plate picture based on bumper height & car type - that was fine as it clearly hit the plate, I'm not sure of what is being snapped these days.

BTW - SS did you have to prove somehow it was "your" car since you didn't have the slip or did they just look it up and let you drive away?