Receiving packages from hot zones

Let go

Set it aside in an unused room for three days to let anything die off and wash your hands after you put it there, Overly Dramatic Chicken Little.

Leave it on the porch for a few days.

Two items.

One, viruses don't last forever on a surface. They have different tolerances. Very few of any kind of transmissible diseases would last as long as your package was in transit.

Two, your mail is heavily, heavily irradiated along its way; in the aftermath of attempts to use the mail to spread bioagents, your mail is more sterile than your neighbor who had the thresher-ball sack accident.