The one compiled by the companion of the Messenger of Allah (sal Allahu alaihi wasalam), Uthman ibn Affan (3rd Khalifah) is in the Museum of Topkapi in Turkey today.
If someone questions why Uthman compiled one, its because he's a companion of the Messenger of Allah. Our religion is dependant upon the companions since they conveyed the religion to the rest of mankind. So we do not doubt Uthman's reliability since he sacrificed his life and wealth for Islam throughout the life of Allah's Messenger, and he would not lie about the revelation.