I think they are completely fake.
Only one of the images has the UFO centered in the view, and that happens to be the one with the guy pointing his camera at the wrong angle in the
sky. That is very common for hoaxes that start off with empty pictures of the sky, and they later digitally add the UFO into the images.
It is common for amateur hoaxers to think that if they don't center the UFO in the image it would make it look more realistic, and that is what they
did. But, they were forced to put the UFO in the center of one image because that is approximately where the other guy's camera was pointing. It is
also common for amateur hoaxers to get the position of the UFO wrong when trying to make it look like someone else is taking a picture of it.
Jerusalem UFO hoax ring a bell?
The UFO is too high, making it look like the guy
didn't even have the UFO in his camera viewfinder. Common mistake for people who don't have a good grasp of the laws of perspective.
If that is the shadow on the ground, then it is all wrong. A shadow shouldn't be the same size as the object if it is was that high off the ground.
The shadow should be much larger. It also shouldn't be that sharp around the edges, the shadow should be much softer.
Also, if it is a real solid object that follows normal laws of physics, the light reflection on it is all wrong. It is not pointing at the Sun.
However, this is a UFO, so everyone can argue it might not follow normal laws of physics to dismiss those types of errors in a hoax.
I think a couple guys went to Area 51 just for fun. Then decided to take a few pictures of an empty sky so they can later add a UFO to it, and then
claim "Hey look we went to Area 51 and saw a UFO", in hopes of convincing people it is real simply because of the fact they are near Area 51...