I predict that a package being treated delicately throughout the entirety of it's route would be the outlier. Every package is at some point flung across a room/truck. The only question is if it is going to hit another box or a much harder surface.
this is all anecdotal, but seems to fit with the stat that roughly 10% of all packages in the United States are damaged during shipping.[0]
[0]: https://www.huffingtonpost.com/adriana-dunn/one-in-10-ecomme... -- couldn't find a direct link to the case study.