Why do you think that the treatment of packages is so rough?
How do you expect them to deliver things in the timeframe you are guaranteed if they don't rush? How do you treat every box like a piece of chinaware and expect to get things done in a timely fashion?
Things are packaged in the boxes they come in for a reason. The MacBooks are in a secure box themselves, with that box secured with a cushion of air and corner protectors inside of the other box to absorb shocks.
I doubt what they did harmed your computer.