I dunno how people in other countries get their mail, but we still have postal services which do not deliver unless you're able to answer the doorbell personally. If I'm not at home, the shipment goes to a local shop, and I have to pick it up there. In a funny twist of fate, my local shop is open only 8-12 am where I'm supposed to be at work. So if I miss a shipment on Saturday, it may well take until the next Saturday when I finally get hold of it. I wouldn't want to do that with a head of lettuce.