I have an AliExpress order made on 11.11 to ship with China Post Registered Air Mail via Beijing. It has been rejected, returned then re-submitted 4 times due to unclear reason of ‘Security return’…and now it seems still sitting somewhere in Beijing (not on the cargo plane). I don’t think it can make its way out of Beijing airport so opened a dispute and got full refund.

Strange thing is that my other similar orders made just a few minutes apart from a different seller however got quickly processed (with the same route and post service) and delivered without any issue.