Over USD 10k equivalent, you need to report regardless currency.

来源: 2017-11-23 07:32:00 [博客] [旧帖] [给我悄悄话] 本文已被阅读:

Coin or currency from the U.S. and/or other countries, including gold coins*

https://help.cbp.gov/app/answers/detail/a_id/332/kw/332/session/L2F2LzEvdGltZS8xNTExNDUxMTMxL3NpZC84dVRfR3N5bg%3D%3D