Only in Canada.

Last Tuesday, Canada Border Services Agency (CBSA) officers at the Pigeon River port of entry on the Ontario/Minnesota border received an interesting handwritten letter from a visitor who had crossed into the country last year.

"Attention Customs: Please accept this $10.00 for duty on an item I neglected to declare in 2018. Thank you."

LUGGAGE FILLED WITH THOUSANDS OF SMUGGLED LOBSTERS WORTH $1.31M FOUND AT AIRPORT

Enclosed with the note was a $10 bill.

The letter was delivered to the CBSA, but the envelope had no return address, no signature and no other information in regards to what the delinquent item was.

"Everyone was rather surprised, because it doesn't happen very often as far as we can tell," said Chris Kealey, a spokesperson for CBSA said to CBC.

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Kealey said the envelope came from the Thunder Bay area, north of the Pigeon River port.

The money will be kept as revenue for the government, Kealey told to Fox News.

“The money goes into the general revenue fund for the government. But what is odd is it was filed under a revenue code called ‘conscience money,’” Kealey told Fox News.

“So we were surprised to get the note, but we were surprised that there existed this code, too.”

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A representative for the CBSA did not immediately respond to Fox News’ request for comment.