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remove the &. that is unecessary. what shell/OS?

if you don't care to see the output then don't use tee. just do this
echo TEST >> file.txt

It is showing! However you don't see it as such.

Let's analyze it:
sed "s:\(\ [0-9]*\ \):\1:"
It matches space200space and encapsulates it, right?

sed "s:\(\ [0-9]*\ \):\1:"
It replaces it...