With "open" you mean - getting the pins out?
Have you considered using a Dremel tool?
For the middle one, I guess you could pull the cover to the back, after you have removed the 2 indentations. Or maybe even with these indentations and some force.
"The techs discovered that German locks were particularly difficult" - Robert Wallace, H. Keith Melton w. Henry R. Schlesinger, Spycraft: The secret history of the CIA's spytechs from communism to Al-Qaeda (New York: Dutton, 2008), p. 210