It is reported from Ismail ibn Ibrahim from Ayyub from Naafi from
Ibn Umar who said: "Let none of you say 'I have acquired the whole
of the Qur'an'. How does he know what all of it is when much of the
Qur'an has disappeared? Rather let him say 'I have acquired what has
survived.'" (as-Suyuti, Al-Itqan fii Ulum al-Qur'an, p.524).
Ubai b. Ka'b said to me, "O Zirr, how many verses did you count (or
how many verses did you read) in Surat al Ahzab?" "Seventy-two or
seventy three", I answered. Said he, "Yet it is used to be equal to
Surat al-Baqara (ii), and we used to read in it the Verse of
Stoning". Said I, "And what is the Verse of Stoning?" He said, "If a
grown man and woman commit adultery, stone them without hesitation,
as a warning from Allah, for Allah is mighty, wise". (Jeffery, "Abu
Ubaid on Verses Missing from the Quran", The Muslim World, Vol.
28.p.62).
A'isha (Allah be pleased with her) reported that it had been
revealed in the holy Quran that ten clear sucklings make the
marriages unlawful then it was abrogated (and substituted) by five
sucklings and Allah's Apostle (may peace be upon him) died and it
was before that time (found) in the holy Quran (and recited by the
Muslims). (Sahih Muslim, Vol. 2, p. 740).
It's not the first and the last hadith that makes this claim... basiclly the 'real' quran died with muhammed my friend... it's an incomplete edited book of scraps.