The C# vs. C Natural question

Although I understand the reasoning behind the C# vs. C Natural question, I can't find any evidence that the C# needs to be changed.

No score that I can find has it listed as a C# and I can't find any discussion about the note.

Here are a few pictures of scores I DID find--the last one is the Beethoven manuscript:








If anyone finds anything different, please let me know. For now, it stays C#.

plc