I've simply avoided using USPS/EMS altogether for cross-country shipments. DHL/Fedex only. Once package has been passed on to courriers there's little that shipper/sender can do.
Because some customers want the lowest cost for shipping, even if it means higher risk of a missing package.
So, Forstner is Made in China. Shipped to the USA to Forstner. You buy and Forstner ships it back to China. Have you asked , if they can ship ( after payment ) direct from the factory in China to you in China?