"Generally" is the key word, I guess just a few mail packages are charged import taxes.
I purchased an used Omega manual watch from a Japanese seller in 2018. USPS left a bill/note at my address (US) insted of a watch.
Once the bill was payed at the USPS office (customs duties were the description of charges) the USPS employee brought the watch to me.
If I remember correctly , the charges were around 7%.
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