(4)PRIOR DISCLOSURE If the person concerned discloses the circumstances of a violation of subsection (a) of this section before, or without knowledge of, the commencement of a formal investigation of such violation, with respect to such violation, merchandise shall not be seized and any monetary penalty to be assessed under subsection (c) of this section shall not exceed—
(A)if the violation resulted from fraud—
(i)an amount equal to 100 percent of the lawful duties, taxes, and fees of which the United States is or may be deprived, so long as such person tenders the unpaid amount of the lawful duties, taxes, and fees at the time of disclosure, or within 30 days (or such longer period as the Customs Service may provide) after notice by the Customs Service of its calculation of such unpaid amount, or
(ii)if such violation did not affect the assessment of duties, 10 percent of the dutiable value; or
(B)if such violation resulted from negligence or gross negligence, the interest (computed from the date of liquidation at the prevailing rate of interest applied under section 6621 of title 26) on the amount of lawful duties, taxes, and fees of which the United States is or may be deprived so long as such person tenders the unpaid amount of the lawful duties, taxes, and fees at the time of disclosure, or within 30 days (or such longer period as the Customs Service may provide) after notice by the Customs Service of its calculation of such unpaid amount.
The person asserting lack of knowledge of the commencement of a formal investigation has the burden of proof in establishing such lack of knowledge. For purposes of this section, a formal investigation of a violation is considered to be commenced with regard to the disclosing party and the disclosed information on the date recorded in writing by the Customs Service as the date on which facts and circumstances were discovered or information was received which caused the Customs Service to believe that a possibility of a violation of subsection (a) of this section existed.