Uscan shorts me a dime... "hey this thing shorted me a dime." [gets dime from attendant]
Uscan clearly gives me more than my 20 cents change, ---grab it all, put it in pocket, leave, count profit later, out of camera sight.
I realize we're talking about literal change here, but I figure they wouldn't come find me to let me know I was shorted a nickel or hunt me down when something doesn't ring right, so it's up to me, the consumer, to be on my game