U.S. Customs and Border Protection officers in Michigan seized five jars of ancient Egyptian mummy linen coming illegally through the northern border last month.

Inspection of a shipment on a Canadian mail truck in Marysville, Michigan on May 25 revealed the illegal antiquities believed to be from between 305 to 30 BCE, CBP said in a news release.

CUSTOMS AND BORDER PROTECTION BOSS OUT AMID CONTROVERSY OVER DETENTION CONDITIONS

CBP officers worked with a Washington, D.C.-based archaeological organization to determine the illegality of the shipment.

The importer was unable to prove the antiquities had been removed from Egypt before April 2016, which would be a violation of the Convention on Cultural Property Implementation Act.

“This seizure of historical importance highlights the wide variety of federal laws that CBP is responsible for enforcing. I am extremely proud of our officers’ hard work during and after the discovery of these ancient artifacts” said Port Director Michael Fox.

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The U.S. government will now focus on repatriating the artifacts back to Egypt in the near future.