Hi, I know this is a rather old post but since alot of us will buy from overseas so I would like to share my experience
1. Japan does not have any free-trade agreement with US so everything crosses the border is subjected to custom fee and import tax depends on the value
2. If you bought from japan and paid nothing for custom then it is either your item is low in value or you got lucky
3. I bought many many Chanel items from japan and paid nothing but my recent Chanel jumbo caviar bag JPY210k handle by USPS got into custom, sit there for ONE week and then got out, got delivered to my front door together with a $213 bill (thats about 9-10% of the declared value). I paid for it by check btw. Seller declared full value of the bag, marked as gift and described it as "used bag". I dont see any word "chanel" on the form or in the box. The box also did not look like it was opened by US custom at all. I guess they just scaned the box and chanel signature double C lock showed through. Poor me, my luck with US custom ends I guess lol
Very helpful, comparative post!