The phrase "manuscript copies" refers to handwritten copies of a book or document. It means that instead of being printed or typed, the text is written by hand on paper or another material. Full definition
Any new manuscript copy of the Holy Scripture was produced by drawing on not one, but two or more manuscripts. (firstthings.com)
Don't skimp on the polish: Regardless of your publication goals, have the line - edited manuscript copy edited; proofreading may be optional for pursuing an agent or small press if you've had a good line and copy edit. (editorialdepartment.com)
Manuscripts copied hundreds or even thousands of years apart have only a very tiny percentage of discrepancies, and those generally don't affect the meaning of the text. (religion.blogs.cnn.com)