Generally, there are the following methods to identify whether to test or not.
1. Seal number. Check whether the lead seal will be scrapped if it needs to be unsealed. You can check whether the title has changed after entering Hong Kong.
2. Invoice. After the inspection, the port will issue an invoice to the customs broker for the relevant fees. You can ask your freight forwarder to provide an invoice. Better scan it.
3. Pre-recorded single number. Ask the freight forwarder to pre-record the order number, and then call the customs directly to ask whether to inspect the goods.
4. Online inquiry. If your company is a member of Shanghai Cyberport, you can check it online. In the customs investigation.