> If you receive packages let them sit somewhere for 2 days before opening

I am curious if you have a source for the two day number.

I have seen various reports ranging from 12-24 hours for how long this particular virus can last on surfaces like cardboard. The longest estimate I have seen for any surface is 72 hours for stainless steel under lab conditions (i.e. not real-world conditions).

So presumably if it takes 2-3 days for a package to arrive, the contents should be okay if you wait another day or so for the exterior surface to become safe.