Here is a family tree for Matys Koberstein (FS). Here are links to nearby villages with Koberstein families, Belsien and AltHutte .
History of the Netze District. Link for english translation of Our Homeland.
Here is a map of the area. Map of Czanikow at Meyersgaz.org.
Here is also a pdf file for a book written by Edith and H.G. Schutte about all the families in this area (in German).
Here is a translation of this book into english up to page 90.
Here are two additional records I have found.
record title: Germany Births and Baptisms, 1558-1898 name: Johann Christoph Koberstein gender: Male baptism/christening date: 17 Jul 1787 baptism/christening place: Czarnikau, Posen, Preußen, Germany birth date: 15 Jul 1787 father's name: Christoph Koberstein mother's name: Anna Dorothea Tesk indexing project (batch) number: C92628-1 system origin: Germany-EASy source film number: 1191147
name: Anna Maria Missall gender: Female baptism/christening date: 25 Mar 1784 baptism/christening place: Czarnikau, Posen, Preußen, Germany birth date: 21 Mar 1784 father's name: Martin Missall mother's name: Anna Maria Doberstein Or Koberstein indexing project (batch) number: C92628-1 system origin: Germany-EASy source film number: 1191147