I understand that gift from a foreign entity (in this case, my non-US parents) is not taxable, but has to be reported.
According to the IRS' instruction on Form 3520, I only have to report the gift if it's over $100,000. However, after I brought the cash into the US (without declaring at customs because it's slightly under $10,000), I made a $10,000 cash deposit at my bank account, which crosses the $10,000 threshold that requires a Form 8300 reporting. Without reporting, this could look suspiciously like money laundering to the IRS (who has been quite trigger-happy in seizing money). So I'd like to declare the origin of this money.
How should this be done? Form 8300's instructions seem designed for reporting cash payments of business, not cash gift.