The original document in question have been "found" in Trump's office. But yes, we don't know who may have copied them (if they did), or who he may have shared them with (if he did).
And to try to play at least some Devil's Advocate to the government's claim (always a good thing), the government would have to prove their claim that the documents were indeed removed from the main cache specifically to obstruct the investigation. Though I would assume the sworn affidavit by the lawyers would suffice. At the least, it would seem the signatory attorney might have legal liability.
I swear, it's indeed Nixonian but on freaking steroids!
Not only the attorney, but Trump as well.
Depending on the type of copier and what the set up is, if the document was scanned for print or for saving on removable media, the copier may have that in its memory.
I think the FBI should have seized the "computer" and what ever internal server that exist in Trump Org & Mar-a -Lago.
It may well be that some of Trump associates who are overly devoted cultist groomed, may need to be observed or investigated.
________________
I'm not sure if any of you hear the reporters talking about the strange number of human assets that have been killed during the Trump term and after he left office, but investigation certainly needed to be put on steroids... because nothing about this is a small matter.
Trump spent years talking about Hillary, and here is he not in office with Classified Top Secret Documents.
There is likely so much more to this whole series of conduct acts regarding Trump, both in office and since he has been returned to public citizen status.
His vitriol toward Biden and this countries people and our government systems, I don't doubt that he used and/or planned to use those documents to do as much damages as he could to our current administration and this nation.. Because that is the vengeful mentality he has when he can't dominate and dictate over something.
I think investigation will show far more treasonous acts than what was indicated in the Mueller Report, and Congress is going to have to make some legislation to ensure that "NEVER" again, will any one have the unchecked power to do what Trump has done, and they have to do more to create a stone steel lined wall, that separates the Divisions of Government.
It will be decades before we get an educated enough society to accept the fact that nothing in the Constitution sanction nor supports "political parties". The design of our Congress never need the divisiveness of Political Parties. I think the younger more educated future generation will come to that level of understanding.