You may check CBP web site for detail.
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6R/{H tHJahK:"k The following is mentioned in U.S. Customs and Border Protection Declaration Form
. N5$s2t >)F)@KAuN4 Money And Other Monetary
YQ-V^e6 Instruments
ocj^mxh=O You may bring into or take out of the country, including
7MX5hZF" by mail, as much money as you wish. However, if
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k it is more than $10,000, you will need to report it to
1:Raa 5 CBP. Ask the CBP officer for the Currency Reporting
?KFj=Yo Form (FinCen 105). The penalties for non-compliance
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can be severe.
2 o5u02x “Money” means monetary instruments and includes U.S.
`$] ZT>& or foreign coins currently in circulation, currency, travelers’
iT~ gt/K checks in any form, money orders, and negotiable
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mH5+ instruments or investment securities in bearer form.