If the mail takes longer than a week to show up, it's a safe bet your mailman has just tossed it in the trash. But not always! Sometimes you just have to wait 45 years.

Marine Park resident Susan Heifetz told Brooklyn Paper she was stunned to receive a birthday card from her mother last week—postmarked 1969. The card was intended to arrive for her 19th birthday, and Heifetz's parents have since passed away but...better late than never!

Heifetz was alerted to her overdue card by the man living in the apartment that had served as her childhood home, who said that he'd received a piece of mail dated June 26, 1969. When Heifetz asked him to describe it, he said the envelope bore lipstick marks—a habit of her mother's. "That’s something my mother did with letters — seal it with a kiss,” she said.

A spokesperson for the Postal Service said the likely explanation is that someone had been hanging on to the letter, and recently reintroduced it into circulation.

“What we typically find is that old letters and postcards — sometimes purchased at flea markets, antique shops and even online — are re-entered into our system,” post office spokeswoman Congetta Chirichello told the paper.

Another note from an old flame was also delivered, and a third will be hand-delivered to Heifetz's residence today. After the excitement of the first two, it's almost certain that today's surprise will just be a long-unpaid gas bill.