Why won't they let them close their doors?

We all at some time have been excitedly waiting for the UPS truck to arrive to deliver a package. Have you ever wandered why delivery drivers like UPS always have their doors open? When it is blistering hot outside they can't be cooled by the air conditioning. It definitely isn't as safe if they happen to wreck either. Unfortunately sometimes when packages arrive they are occasionally broke when you take them out of the box.
  Now you have to find a way to send it back. When you own a little car the box might not fit in it for you to return it. It happened to a friend and she wore herself out trying to make it fit. Then out of nowhere as she started to bring the large package back inside a UPS truck pulled up to her house. She had not been waiting on a package but she had never been so excited to see a UPS truck that she wasn't waiting for but she sure was praying for help. Although he looked exhausted after he had been hauling packages all day he took her big box to return it.
  She said she felt more happy about UPS taking away her box than she had ever felt when getting any box she had ordered. She was so excited about UPS showing up unexpectedly when she felt defeated. She was no longer angry that it was delivered late and it had arrived broken. She was no longer frustrated  that it wouldn't fit in her car. She was able to JUST FLUSH IT all because she focused on the fact that the UPS truck showed up out of the blue and took the big box.