Non-Non a perdu un truc mais ne sait plus quoi

Description

This morning, Non-Non lost something. The problem: he no longer knows what. He then asks for help from his friends Bio, Grouillette, Zoubi and Grocroc. You know, my yellow thing, You know… It’s a yellow thing and hard too, It’s not an oval thing… It’s more rectangular. Everyone suggests an idea but without success! And even in Grouillette’s collection of weird objects, there isn’t the No-No thing.
But where could he be?