Hi
From the photos it’s kinda hard to tell
Here’s what you can try!
Get a Mac or a windows laptop with iTunes (finder/Apple Music on more modern macs)on it and plug them in and see if iTunes recognises them as a iPhone
Also look at the back camera,if it looks like there is depth(you may need a torch/flashlight to see)it’s most likely real
However...
if any of the camera look off like a image and not really 3D looking they are most likely fake
If you tell me a bit more in the comments I can help find the fakes :-)
Thanks:-)