The issue in this grievance is whether rural carriers are entitled to additional time when they make more than one pass to a locked mail box. The parties agree that a locked mail box should have a slot large enough to accommodate the customer’s normal daily volume of mail. The parties further agree that there may be instances during a mail count when additional time is warranted for making more than one pass to a compliant mailbox dependent on the particular fact circumstances.
http://www.knowledgebase.www.ruralinfo.net/2014/07/pre-arb-relating-to-locked-mailboxes
via News Info.