That's entirely different because the agency is an intermediary. How can you abuse a utility service to launder money?
Even then unless legally obligated I don't see why you should care. Just report the highly suspicious activity and let law enforcement handle it. Not your problem.
They don't get in trouble because you can't abuse a utility to launder money. The onus is on you to provide an example here.
You only need to look into your customers to the extent required by law; beyond that it's not your problem. In your example with an intermediary a failure to report suspicious activity could potentially result in you being viewed as an accomplice.
Even then unless legally obligated I don't see why you should care. Just report the highly suspicious activity and let law enforcement handle it. Not your problem.