The two on the left look like they were released that way! But the two on the right have a little too much facial hair to be convincing Imperials. That's something that always gets me with some Imperial custom figures - too much facial hair. The Empire always struck me as a bit too uptight for that sort of thing.
I get the same sense, too.
In keeping with Rob's comment in the other thread about Motti and Piett in Hoth rebel disguise, I look at the two on the right as rebels in Imperial disguise. In best sterotypical Fargo language: "Nothing to see here. We're just a couple of Imperial officers doing Imperial stuff, don'cha know." Haha.
@Rob - the face skin tone on the right-most looks a bit darker than the hands. If you care, maybe pair that noggin with the gloved hand?