Recent research by infectious disease experts published on 17 March 2020 in the New England Journal of Medicine found that "On cardboard, no viable SARS-CoV-2 was measured after 24 hours". SARS-CoV-2 is also known as coronavirus or COVID-19. They did advise caution, however, on this result as they found that the standard error in their cardboard experiments contained a larger variation than other surfaces, most likely due to the degree to which the person who infected the surface was carrying the virus. In layman's terms, the length of time COVID-19 will remain on a surface depends on how badly the person who put it there had the disease. The researchers also found the virus still active on plastic and stainless steel after 72 hours, but with reduced potency by that time.
Regarding the safety of packages arriving from anywhere, including overseas or areas where COVID-19 has been detected, the World Health Organisation states that "The likelihood of an infected person contaminating commercial goods is low and the risk of catching the virus that causes COVID-19 from a package that has been moved, travelled, and exposed to different conditions and temperature is also low." The virus is unlikely to survive in the time it took for your package to arrive from its destination.
The risk you do need to be aware of is from the person delivering your packages. You're no longer required to sign for any package delivered from Glide Print, and all our couriers have implemented safety measures to help stop the spread. Washing your hands immediately after handling packages and not touching your face while you do handle them is the best safeguard. If you want to be doubly safe, ask the courier to leave your packages where they can be stored for 24 - 48hrs so you're not handling them at all during the time the virus could still be present, and wash your hands after that handling too.