Customs has the right to inspect packages imported into China, and has the right to refuse imports or return packages. Here are some situations that may cause a package to be returned by customs:
1. Prohibited import items: Chinese customs prohibit the import of certain items, such as arms, drugs, gambling equipment, endangered animals and plants, etc. If the package contains prohibited items, customs will refuse import and return the package.

2. No necessary documents and permits: Some items require specific documents and permits to be imported into China. If a package does not have these documents and permits, customs may refuse import and return the package.

3. Exceeding Restrictions: Items imported into China may be subject to quantity and value restrictions. If the quantity or value of the items in the package exceeds the limit, customs may refuse import and return the package.

4. Counterfeit and shoddy products: Products imported into China must meet Chinese quality and safety standards. If the package contains counterfeit and shoddy products, the customs will refuse to import and return the package.
5. Unable to determine value and classification: If customs cannot determine the value and classification of the items in the package, they may refuse import and return the package.
Under what circumstances is the risk of being inspected when entering the country high?
Here are some situations that may lead to screening upon entry, putting you at a higher risk of screening:

1. Passports, visas, immigration cards and other documents are incomplete or have problems, such as insufficient validity or errors.

2. Carried some high-risk items or the quantity of items exceeds the prescribed limit, such as medicines, food, currency, animals, plants and their products, etc.

3. Failure to truly and accurately declare the items you are carrying or the value of the goods is too high, exceeding the allowable amount.

4. The travel purpose, itinerary plan or accommodation arrangement is unclear or illegal.

5. Have a criminal record or a history of being denied entry or deportation.

6. Showing erratic or suspicious behavior or attitude before customs.

It should be noted that even if your situation is not in the above list, the customs may randomly check some passengers for inspection. Therefore, in order to avoid unnecessary trouble, it is recommended that you understand and abide by the local customs regulations before entering the country, and declare the items you are carrying honestly and accurately.