What does “Import Security Scan” mean?

If you got the status of “Import Security Scan”, there are two possibilities :
1)If the parcel was original shipped from China and the LOCATION column shows as a China City such as Beijing,Shanghai etc, then it means the parcel was returned back to China from oversea country. Normally the parcel will be send back to shipper and recipient will NOT receive this parcel in future unless the shipper pay extra shipping fee and send it again.

2)If the parcel was original shipped from China and the LOCATION column shows as recipient’s country, it means the parcel has arrived destination country import customs and will be delivered as soon as the customs clearance finishes.

3)If the parcel was original shipped from other country outside China and the LOCATION column shows as a China City such as Beijing,Shanghai etc,then it means the parcel has arrived China and will be delivered as soon as the customs clearance finishes. check How to get refund for lost or long-time-no-arrival parcel.