What does the immigration package mean?

Refers to the U.S. Immigrant Visa Package.

After passing the interview, you will receive the visa package from the U.S. Consulate in Guangzhou in about 20 days. An important issue is that in addition to being able to take out the passports of yourself and the dependent beneficiaries in the package, the rest Remember not to open the sealed envelope. U.S. customs officials have the authority to open it only when entering the United States. If you open the sealed visa package, you may be restricted from entering the United States.