glad you reminded me about the huge poster that came with the
original vinyl pressings...
its an important part of the story of how mick (and his people) were
able to so successfully punk keith (and his people)
the poster was five feet by two feet, printed on both sides. the
size of 20 album covers or, if you prefer. 10 album covers front
and back...

this poster was folded over multiple times and wrapped around
the subject cardboard sleeve to serve as defacto cover art within
the shrink wrap. Folded this way Keith became the only Stone on
the front cover, while Mick was alone on the back...

this was how keith and his people were fooled. keith was told "you're
getting the cover, mick's only on the back, the opposite of
Goat's Head"
and keith fell for it
the extremely clever and hilarious catch was that the poster was on
such thin tissue paper that it fell apart and/or wrinkled severely as
soon as you unfolded it, so that 99% of them were soon trashed and
everybody was left with only the nearly keith-less cardboard cover art...
an elaborate and magnificent joke i think. a great piece of conceptual art.