I don't recall any serious participant in this conversation saying all the documents were planted by the FBI.
It is widely known that then-President Trump declared, when it was within his power to do so, that he was declassifying everything related to the Russia Hoax and the Clinton email scandal.
Here's a link from Reuters about it. An excerpt:
The "Schrödinger's Classification" comment was clever, but I think the Washington Post did it better.
Look, I agree that the classification/declass process sucks. I don't like it. But just because we don't like something, or someone, doesn't automatically make it, or them, illegal/criminal.
I don't know what was seized from Mar-a-Lago. But if it was related, even tangentially, to information that then-President Trump declassified, then it seems to me that the Trump team has a good leg to stand on in this whole thing. Given the information above, at this point in the investigation, wouldn't you agree?