In the Internet lingo, unpacking a package means that something purchased from Taobao or other websites needs to be opened or is about to be opened.

Taobao

On December 24, 2015, Alibaba Group and the Information Center of the National Certification and Accreditation Administration officially signed a cooperation framework agreement. The two parties jointly launched the "Cloud Bridge" data sharing mechanism. Alibaba became the first e-commerce platform to directly access the national CCC certification information database.

Express unpacking, as opposed to packing or packing, here means unpacking the package delivered by the previous outlet. The package from the previous outlet is a large package that contains your package and other people's packages on the same route as yours.