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U.S. Border Patrol agents at the Pembina station, just south of Canada and near the North Dakota-Minnesota border, seized the guns thanks to help from a trained dog.
The shipment from Hong Kong and was bound for a Woodbury residence.
"There is a real danger with bringing fecal matter into the US," a Customs and Border Protection official said in a statement.
The woman declared the feces upon arrival.
Travellers heading to the United States Tuesday afternoon can expect delays at the Ambassador Bridge.