The same story which I based one of my shirt designs on:
The design i’m referring to of course is the Keep Calm And Carry One t-shirt. Pretty neat history to the original poster. I’m always surprised to hear 2.5M posters were printed at the beginning of WWII, and yet none surfaced until the year 2000. I suppose paper is pretty fragile for long term storage if the conditions are not ideal. I’m just waiting for a huge stockpile to be found someday so I can pick up an original to hang on the wall.