Great minds think alike ;-)
Article 1er. Tout grenadier ou voltigeur qui est sorti le 19 mai de Lugar Nuevo sans armes sera dégradé et mis à la queue d’une compagnie du centre.
Art. 2. Tout grenadier, voltigeur ou fusilier qui est sorti de Lugar Nuevo sans armes ou avec armes perdra son rang d’ancienneté.
So it seems the chaps who threw their muskets away were deprived of their elite status (and the higher pay) by being transfered to a centre company, and they as well as the other soldiers who remained in the elite company, lost their anciennity as well.
I don't know what exactly the effect of anciennity of rank and file was in the French army ?