I understand the principle, except that, if you are talking about profits or savings made during the years or months that followed the installation of the community mailboxes, we do not yet have the concrete results because that is very recent.
We are told that everything stopped on October 20, but installing the community mailboxes had only started a few months earlier. At present, we are not in a situation where we can quantify the actual savings or profits. I do not know whether this answers your question.