Think of a virus as a tiny velcro-like thing. Sticks better to certain things than others. It’s also very enamored with high humidity, since it’s outer shell has a significant fatty component. When it’s sitting on a solid, featureless surface like a painted ship’s wall, it breaks down much more slowly than if it’s sitting on something that’s rougher, like a cardboard surface.
There are fewer environments that are more humid than a ship sitting in the water. So it’s lasting longer on painted, solid surfaces in a high humidity environment. The other data came from lower humidity environments and tested various surfaces. On paper, it lasts up to 4-5 days.
We live in a desert state so humidity rarely gets above 50% unless it’s raining.
I’m fine with the 9 day package quarantine. If I need the contents sooner, I can just wash it down with a bleach solution and get on with life.