Does it mean you looked and you saw nothing? Or that you looked and you saw something but not it? Or that you did not really look and that is why you could not have seen it anyways even if it was there? Or that where you looked it was not there? Or that you did not really look because you believed it cannot be there?

How can you tell whether you have evidence that it is not there as opposed to simply accept you do not know whether it is there or not, specially since you don’t want to look at it…?!