There was no raid. A search warrant doesn't presume a raid at all. In fact, they treated Trump with kid gloves, and they wore casual clothes, no jackets with "FBI" plastered everywhere, none of that,
Mishandling of documents that belong to the government do not depend on any classification regime, per the Espionage Act (when it was enacted, there was no regime). Today, classification would be considered as a supplemental fact, but even if they were declassified, it would be the damage assessments by the DNI, that carried weight in any indictment. If they were declassified, and the docs earned a high score as being damaging to US National Security assessed by the DNI, that would put whoever took the documents from there secure locations in legal jeopardy.
Additionally, it is my understanding that the DOJ doesn't indict members of the executive branch merely for possessing classified or any government documents, as long as they cooperate fully and return the documents. But, they should be investigated, damage assessments shouldn't be ignored, and that is occurring under Garland. However, unfortunately for Trump, when he refused to cooperate, return documents, even go so far as to claim, in public, that the documents were his, and make absurd statements taht he could 'declassify with his mind', that will not bode well for him should he be indicted, and if he is indicted on a documents/Espionage charge, the primary charge will be Obstruction, but for that fact, there would be no Espionage mishandling of docs charge. This is why, if anyone has legal Jeopardy, it is not Pence or Biden, it is Trump.
But, let's clear up something regarding classification, even though it's not relevant in any weighty fashion, to an Espionage charge, this idea that a president can wave his hand and declassify documents, en masse, without memorializing each document, recording them down in cooperation and consultation with the issuing authority, is not correct. Note that there is nothing in the constitution about classification of documents. There are executive orders, none of which Trump repealed, that direct how documents should be declassified. Additionally, none of this applies to 'restricted data' classifications, those are nuclear secrets and only the issuing authority can change classification on those, per the Atomic Energy Act, and I believe Trump was in possession of some restricted data documents. Trump has legal exposure, much more so than Biden or Pence does, but, whether or not Garland will seek and indictment, that's another story altogether.
I will provide you with substantiation on the above, points, if you want. Let me know.
See: The Executive Order 13526, issued by President Barack Obama in 2009, which provides the framework for the classification and declassification of national security information. The order sets forth the criteria for classifying information, the standards for protecting classified information, and the procedures for reviewing and declassifying information.