They went missing because someone wanted them to go missing.
Destruction of evidence, obstruction of justice, collusion, and who knows how many more felonies were committed.
Of course we won’t ever know who did it, and certainly NOBODY will ever be punished.
Clapper lied to Congress. Nothing happened. Hillary lied and deleted emails and compromised classified info. Nothing happened.
Perjury and obstruction have become low-risk crimes for members of the Deep State. That must change and change soon.