The World Health Organization (WHO) confirmed via Twitter on February 1 that "people receiving packages from China are not at risk of contracting 2019-nCoV" and have drawn from their analyses that the "coronaviruses do not survive long on objects, such as letters or packages". 

The United States Centers for Disease Control and Prevention (CDC) has also stated that “there is no evidence to support the transmission of 2019-nCoV associated with imported goods.”

https://www.cdc.gov/coronavirus/2019-ncov/faq.html

We call on all countries to implement decisions that are evidence-based and consistent. WHO stands ready to provide advice to any country that is considering which measures to take.

The Committee does not recommend any travel or trade restriction based on the current information available.

https://www.who.int/news-room/detail/30-01-2020-statement-on-the-second-meeting-of-the-international-health-regulations-(2005)-emergency-committee-regarding-the-outbreak-of-novel-coronavirus-(2019-ncov)

There have not been any cases that indicate packages or their contents carry such risks. Authorities are taking strict measures on this public health event, and we are also paying close attention to the situation and will cooperate with relevant authorities when possible.

At present, the protection and treatment measures of the Chinese government and all sectors of society are very perfect, and the epidemic will be gradually controlled and improved.