Maybe I have misunderstood OP question. But to me the answer is simple:
As soon as we are thinking, at least a thought exists - not to mention apparatus
(brain) for generating that thought. Therefore we cannot even think about this
issue without "something" exists.
But if there was nothing, just emptiness, no thought could be generated. We cannot even imagine looking at an empty world from "outside" and say "There we have an empty world
containing nothing!" Because the concept "world" must also include any observer. Also a world just imagined by a brain, contains that observer and therefore is not empty.
My point of view may be too trivial and perhaps I have not fully understood the complexity
of OP question.