And all the people ordering from Amazon? I would assume that on the whole, Amazon is better than every member of the public physically going out and shopping at a store.
The virus apparently doesn't do great on cardboard; you've got a day or so of transit time for it to wear down...
Assuming the guy who brought the package to your door isn't infected.
N95 masks though, those can’t exactly be ramped up and made in your shop.
You can improvise a mask from paper towel and tissues that is ~90% effective (https://www.bkreader.com/2020/03/07/heres-a-diy-way-to-make-...)