I love the fact people are still finding new merchandise 30 odd years on. I think we must hoard as a species. Those are certainly not images I've seen, unless someone with the encyclopedia can set me right. I'll tell you what though - I don't think it's a poster. Look at the sheet with the print on it, and the sheet with nothing to do with Star Fleet (!) Then look at the Star Fleet one. Look closely. My guess would be, it's a sheet of stickers or postcards are similar. It looks like they would break apart, can you see the joins? So it might be a set of collectible cards perhaps? In fact, didn't I see someone mention a game here earlier - Star Fleet Top Trumps?! The mind boggles!
Edit - this was the game I was thinking of, although the images aren't the same, perhaps the principle is? http://www.ebay.com/itm/X-BOMBER-the-St ... 1314906994