Big Green Box

Where have all of the big green boxes gone? Maybe it is just my neighborhood, but the green boxes have disappeared. The boxes I am talking about are the mail boxes that used to sit next to the blue mailboxes. They contained the mail overflow that the mailman was supposed to deliver that day. It was a holding box. I can't remember when they left. They just disappeared and no one seemed to notice or care. I am sure there are dozens of other old fashioned items that have gone by the wayside that no one has noticed. I guess that once something's usefulness is phased out, no one cares about it. Out of sight, out of mind.