If we have a container that is tamper evident then they can't do all those computer modifications you mentioned without we finding out the computer has been tampered with.
It's not a modification, it's a clone. Does your container allow operating the computer (even when locked)? Because operating the computer is all that I need to be able to make a visually identical replica right until the logon screen.
Maybe I misunderstand you what you mean with a clone of the computer. Do you mean take my entire computer and replace it with a completely different computer that is the same model?
Because if that is what you mean then they can't clone the tamper evident container because then it wouldn't be tamper evident. Glitter nail polish for example couldn't be cloned because the pattern would be different on the second computer which is the clone.
Or do you mean to do everything on my computer without having access to any hardware/firmware? You would just simply boot up the computer and somehow hack it? How?