Similar thing happened back in the 80’s at a Sorting Office where I worked. The letters, then, were sorted into a 48 box fitting. They took a row of 48 box fittings down and discovered a postcard that was alleged to be 100 years old. I think they had a little ceremony with the living descendants of the addressee. This was when the Royal Mail prided itself on delivering the mail.
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Similar thing happened back in the 80’s at a Sorting Office where I worked. The letters, then, were sorted into a 48 box fitting. They took a row of 48 box fittings down and discovered a postcard that was alleged to be 100 years old. I think they had a little ceremony with the living descendants of the addressee. This was when the Royal Mail prided itself on delivering the mail.