Actually they were Mattel give-away posters. We have a scan of an ad giving one of them away listed here:
https://www.rainbowbrite.co.uk/index.ph ... ter-ad-174
This poster (second you have listed) was in a Mattel "Barbie" Magazine, the other was probably given out in another Mattel Magazine, either "He-Man" or "She-ra" or some other magazine they had at the time. They had a few different Mattel magazines in 1985. There are advertisements to order Masters of the Universe magazines in the Barbie magazines for example.
Because these were free mail-in offers, I'm not sure if we could know the number of how many they actually printed, though I'm sure not many have survived.