U.S. Customs and Border Protection said Wednesday that it seized $4.65 million worth of "hell money" from a couple arriving from South Korea last week.

"Hell money" is counterfeit bank notes that are intended to be "presented as burnt offerings to the deceased," according to CBP. The agency said the custom is "often practiced in certain Asian cultures."

CBP said the seizure happened on Feb. 12, and that it was being carried by the couple from South Korea.

"Each person made conflicting statements about the amount of currency they were carrying," CBP said. "CBP officers referred the couple for a baggage examination."

The search resulted in a find of 93 bundles of counterfeit $100 bills, and 32 bundles of fake Vietnamese Dong, which is that country's currency.

"CBP reminds international travelers that the manufacturing of, or importation of counterfeit Federal Reserve notes could result in federal charges," CBP said. "Agents from Homeland Security Investigations and the U.S. Secret Service took custody of the fake currency."