Why would you expect an international shipment to not be held by Customs?
Because it has never happened before.
Try and tell the judge you speed every day and don't get a ticket so you shouldn't have to pay the one ticket you did get.

If US customs wants and import duty, can I send it back to HK and get a refund??
Probably but the cost to send the stuff back, prove you sent it back and the time it will
take be fore the refunds arrive aren't going to be worth it.

I believe that if import duty's or taxes are due HK should have included them on the front end. It is not my responsibility to keep track of these things. I am a retail customer not an importer of resale goods. It is certainly not right for my government to extort fees for me to take possession of my property.
They are not extorting you, this is a fee they collect to help protect American businesses, especially since they do have to pay the duty.
If you read everything carefully on HK's webpage they tell you that you are responsible for any duties levied. They use methods to try and
reduce your risk but it is still your risk.

Stop being such an entitled cry baby and pay your fair share!

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