If you read Dutch and can stand a cantankerous stand towards all things Moulinsart, you should be following A La Recherche Du Tintin Perdu. Recently its anonymous editor discovered a Dutch promotional flexi-disk with an audio version of Tintin’s The Shooting Star. And even though the liner notes mention Casterman as the rights holder, I don’t think the art was actually vetted.
Do try the sound fragment. It smells of olden times.