It could be Capcom had some circle seal boxes left over from before the switch to oval seal and instead of disposing of them and wasting money, decided to use them up.
Yes, I couldn't find an Adventures in the Magical Kingdom manual without a star either. It could be there were a very limited number of manuals printed without the star or the person giving Wiz that information forgot to mention the star.
I added the star to your submission, Netto.