the ayu-mi-x "poster" isn't a poster, it's just a big fold-out credits insert. They all come that way.
And the plastic slide case from ayu-mi-x III is a first-press thing, but as far as I know, the first press is still pretty widely available, especially for the AO version.
The second press has an orange or green outline and the ayu-mi-x III title printed on the back of the jewelcase, and the tracklist printed on the insert.
