The common reasons for international express delivery being detained by customs include:

Firstly, declaration issues. Abnormal declaration, such as inconsistent declared value and actual value of goods, can lead to customs suspicion and detention.

Secondly, prohibited items. Each country has its own list of prohibited items for transportation, such as liquids, powders, food, drugs, flammable and explosive materials, firearms, radioactive materials, coins and antiques, fruits and vegetables, etc. Packages containing these items may also be detained.

Tariff issues are also a reason for package detention. If the declared value of the goods exceeds the local tariff threshold, corresponding tariffs need to be paid before the package can be released.

In addition, incomplete or missing packing lists may also lead to package detention. The packing list is a supplementary document to the invoice, and if it is incomplete, it may raise customs suspicion and result in package detention.

Finally, some items require corresponding certification documents, such as well-known brand products. Without necessary certification documents, packages may also be detained by local customs. If certification documents cannot be provided, the only options are return or destruction.