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"not been noticed" is a grammatically correct construction in written English.
It is a passive construction in which the subject (something or someone) is not mentioned, but implied. It means that something has not received attention or been observed by someone. Example: The mistake had not been noticed until the final report was submitted. In this sentence, the subject (the person who made the mistake) is not mentioned, but it is implied that they did not notice their mistake until it was pointed out in the final report.
Exact(46)
The solid job Cottrell has done recently has not been noticed solely by opposing coaches.
And that is why he currently acts with an aggressiveness that has not been noticed in him before.
How they've been here for 15 or so years and not been noticed or captured beforehand is anyone's guess.
But they have not been noticed because the dollar is now compared with other paper currencies like the euro and yuan where shifts have been nothing like as extreme.This raises a further puzzle.
They had not been noticed by a patrol team a few hours earlier, and behind the damaged -- but intact -- door were nearly a thousand tons of gold and silver.
Such celebrity might not have come his way had he not been noticed, in 1967, by the BBC producer Mike Appleton, who attended a film lecture given by Jenkinson at St Martin's School of Art, in London.
Similar(14)
Not be noticed.
Not being noticed is of their essence.
Nothing more painful than not being noticed.
It may not be noticed for a hundred years.
How could a scar that size not be noticed?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com