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No, you can not get "The Wanted" poster on Moshi Monsters.
However, you can get a "Strangeglove Wanted Poster" with a code.
The code is: volcano
There was no such thing as a wanted poster during the Middle Ages.
I don't think there was a wanted poster of Fredrick Douglass
Yes, there was a wanted poster. There was a 10,000 dollar price on his head dead or alive.
See the related link for an example of a genuine Ned Kelly wanted poster from the 1880s.