#2 works for Biden. The volume of stuff for him is pretty small and the items seem to be daily briefing sheets, things you might take with you for a call later or to review later.

#4 definitely works for trump, there were deliberate attempts to dissuade the government from getting the documents they knew trump had, hence why it took an FBI raid to get the crap from Mar-a-Lago.

Biden and trumps offenses are vastly different, but as you mention they do point out some issues with the way our government handles Classified materials.

Maybe it shows utter contempt for the public trust.
Maybe a government should be more transparent.

Trump stole the stuff, lied, and tried to keep it. Biden's staff mispacked some stuff.

The VICE president has NO AUTHORITY to declassify material, explicit or understood, under ANY law. Therefore Biden is LAWLESS, a RENEGADE (Barry's nickname), and above the law. President Trump declassified docs, cooperated fully with National Archives, and had secret service guarding the location. By result Obummer is GUILTY for these classified docs being STOLEN by his Vp and must be raided IMMEDIATELY by the FBI at each of his multimillion dollar mansions. Biden stores state secrets, NUCLEAR CODES!!! at garages, Chinese clubs, basement, Epstein island, etc. just about anywhere and NO ONE knows where they are. Who accessed these docs? Who was Biden selling them to? How many people came within five feet of these classified docs? When is Biden going to Guantanamo Bay?

You never did any of that

The only secure document in Washington is epstein's list