You may check CBP web site for detail.
eE+zL~CE y.HE3tH http://www.cbp.gov *ix&"|h }qRYXjS The following is mentioned in U.S. Customs and Border Protection Declaration Form
$s5LzJn vA*!82 Money And Other Monetary
H4MFTnJ{ Instruments
L6O*aZ| You may bring into or take out of the country, including
hVd%
jU: by mail, as much money as you wish. However, if
8W9kd"=U it is more than $10,000, you will need to report it to
fMy7pXa_ CBP. Ask the CBP officer for the Currency Reporting
^F/N-!}q Form (FinCen 105). The penalties for non-compliance
8N'[)Jw can be severe.
= ;4cDmZh “Money” means monetary instruments and includes U.S.
c\065#f! or foreign coins currently in circulation, currency, travelers’
+m^ gj:yL checks in any form, money orders, and negotiable
,)[u<& instruments or investment securities in bearer form.