I don't think we have any way to determine that, or where they're ending up. We're concerned that some have suggested that community mailboxes result in a slower or less productive response to these kinds of mailings, but I don't think we know if something is delivered to a door or to a community mailbox, for instance.
Evidence of meeting #36 for Government Operations and Estimates in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was banking.