Manuscript of the 2nd act, composed by Peter von Winter in the LOC – Library of Congress Washington:

https://catalog.loc.gov/vwebv/holdingsInfo?searchId=12096&recCount=25&recPointer=9&bibId=6245688

This is probably the ONLY surviving manuscript of Act 2 in the world.

There is another copy of this book by a copyist from 1912, both in the original and on microfilm. The copyist made several errors, but it is still wonderful to see such a book: