I do not want to disturb your discussion on the Tholes, but I think you should find this place "Hasusette" (which cannot be the original name of this place).
First: There are two "Oldenburg" in Germany. "Oldenburg in Holstein" which is in Schleswig-Holstein and "Oldenburg in Oldenburg", which is in Lower Saxony in the former german grand-duchy "Oldenburg".
"Hasusette" does not sound german, but may be it has something to do with the small river "Hase", which is in Lower Saxony.
Do you have a document for this "Hasusette"? I think there is a reading mistake.
Anyhow I think this is more a question for the board of "Lower Saxony" than for "Schleswig-Holstein".