OnTheWayOut:
I won't presume to tell you how to feel about this. I only offered the information to give additional insight. I can still see how having to call the branch might appear to hinder reporting to the authorities, but I can say that the branch office did nothing other than encourage us to report it right then and cooperate with any follow up.
I will say that the main reason for us calling in was to (1) make sure we were in compliance with local laws - no mention ever of protecting the corporation and (2) make sure there is a record of the incident so that if this comes up in another congregation or later on someone knows what is going on.