People should not handle any package for at least 3 days after reception assuming this paper is correct (unless they manually disinfect it).

EDIT: actually the paper doesn't seem to conclude that 3 days is enough, and instead than an unknown number of days, but at least 3, is required, at least relative to their detection method

Not to mention that of all industries to pressure their workers not to take time off, delivery and postal services will see record demand, and so it's more likely than the general population that a package handler might be infected...