Do you have these in hand? Or anyway you could take them to a local shop to authenticate.
I’ve seen some really bad fakes and don’t see any dead give always. One way to spot a fake is the boost material which in hand doesn’t look or feel like the real thing. Here’s a link below on real v fake. It’s a 4.0 but certain things like the finishing inside the tongue or the way the back heal tab feels are used to tell the difference. Would also say look at more real v fake videos.
In your pictures the boost to me just looks too large vs the smaller pellet looks of other UBs and some images of the Miami’s I looked at online. If these are fakes, it’s a good fake.