I understand your decision @dmilliz. Its interesting that the less than honest experiences or the perception of dishonesty that you and @missaj had were not in Japanese owned establishments. It begs the question what is it about the culture that makes honesty in situations like this the norm.
It may have something to do with the law/rule that @missaj hinted at coupled with the fact that there are cameras in most public spaces. Or it could just be that the culture has high standards of morality in situations like the one in question.