How do I make a Windows batch script completely silent?

There has been variants of this question asked for generations, but despite writing some quite complicated Windows scripts, I can't seem to find out how to make them actually silent.

The following is an excerpt from one of my current scripts:

@ECHO OFF
SET scriptDirectory=%~dp0
COPY %scriptDirectory%test.bat %scriptDirectory%test2.bat
FOR /F %%f IN ('dir /B "%scriptDirectory%*.noext"') DO (
del "%scriptDirectory%%%f"
)
ECHO

The result of this is:

C:\Temp> test.bat
        1 file(s) copied.
File Not Found
Echo is off.

C:\Temp>

Whereas the "1 file(s) copied." is just annoying, the "File Not Found" makes the user think that something has gone wrong (which it hasn't - no files is fine).