I was reminded of one of my favorite historical tidbits this morning:
The "Keep Calm and Carry On" posters were never actually released during WWII.
They were printed, but then recycled because of paper shortages.
We only know about them because the design was rediscovered and popularized in 2000.
https://www.london.ac.uk/about/history/history-senate-house/story-behind-keep-calm-carry