U.S. Customs and Border Protection (CBP) officers seized a human brain sent through the mail near the Michigan-Canadian border last week, the agency said.

Officers assigned to Port Huron, Mich., were inspecting a Canadian mail truck at the Blue Water Bridge in Point Edward, Ontario, when they spotted a shipment labeled “Antique Teaching Specimen."

The officers opened it and found a human brain specimen inside a clear glass mason jar, the agency said in a news release.

No paperwork or documentation accompanied the package, which originated in Toronto and was headed to Kenosha, Wis.

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“Individuals looking to import shipments such as this need to remember that the Center for Disease Control and Prevention [CDC] has a strict Import Permit Program that must be adhered to,” Area Port Director Michael Fox said.