The 600v 400amp ones can be taken apart nondestructively. I've actually done it. It's pretty awesome. It looks like you can reach right in and touch some wires that go all over the place, but then your hand hits a perfectly clear rubbery gel. You do have to bend the 3 tabs a little bit to slide the plastic cover off once the screws are out, but it didn't hurt anything.
It looks so distinctive, that I seriously doubt a counterfeit would mimic it perfectly.
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