It's an interesting question.
The question of if these documents are classified has already been raised before several judges and the grand jury.
One judge said I have evidence that these documents are classified.
The evidence is prima facie evidence. Which means by looking at the evidence I see it has a top secret classified cover sheet and it is stamped classified. On the face of it I can tell this is a classified document. So to counter that you would actually have to present testimony or evidence to prove otherwise.
https://www.law.cornell.edu/wex/prima_facie
just as classified documents are are stamped showing what level of classification they have when documents are declassified for release they are restamped and cleared. It should clearly say it's a declassified document. You also have to tell all the original agency that created them at the document is declassified. How much of that is required by law? I don't know.
It's an interesting question.
The question of if these documents are classified has already been raised before several judges and the grand jury.
One judge said I have evidence that these documents are classified.
The evidence prima facie evidence.