Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from ANU, Canberra. He has written and translated several Islamic texts and also prepared educational videos on Islamic rulings and practices.
In various libraries around the world that hold valuable Islamic manuscript collections, some writings are attributed to Imam Ali (a.s.).
Although some specialists in paleography and codicology might be sceptic about whether such attributions can be verified, there are strong claims that there are writings that can be traced back to that time. Of course, the challenge still stands, and we can only surmise its attrubution, and not be absolutely certain.
Please have a look at this manuscript of the holy Quran attributed to Imam Ali (a.s.), in his holy Shrine: