You guys are obviously wrong. The reason you get EMPed when you try to scan the crate is because it's full of ST:TMP Klingons, and they're really, really angry that they've been locked in a crate. They've seen their empire become a idiot state full of guys going HONAH AND GLOREH and charging machine gun lines and getting mowed down, and they've seen the Empire become less and less competent.
What's worse? They've been trapped in that crate for centuries, perhaps more. So they lash out at you, trying to kill you. But they can't. All they can do is EMP you. So take pity on them. And take pity on yourself, for god help you when they get out of that crate.