It is historical fact that Khalifah Uthman burnt collections of Qur’anic writing –
Mushafs – which were different to the Qur’an as we know it – Mushaf Osmani. Is it possible that the Qur’an incorporates changes in any of its ayat? If not, why are missing ayat referred to in Shi’ah collections such as that of al-Kulayni?

There are ahadith regarding missing ayat in both Shi’ah and Sunni books, but these only
serve to prove the accuracy of the claim that the Qur’an is protected from alteration. For detailed information please refer to Ayatollah al-Khoei’s The Prolegomena to the Qur’an.