They are still available (some released freely by the publisher, others not), and the paraphernalia (which often contained information required to play the game

They are still available (some released freely by the publisher, others not), and the paraphernalia (which often contained information required to play the game) can be found at http://infocom.elsewhere.org/gallery/greybox.html http://infocom.elsewhere.org/gallery/greybox.html.