I think I'm a chump... Is there a way I can confirm that this is fake/authentic?
Red flags:
-Doesn't say Samsung or Galaxy S6 on the back cover
-Doesn't say Samsung on the charger
-About Phone settings changed after factory reset
-Only says Android on startup
Just look at the about device page he posted. Clue one is the Device name "P6". Second is the Android version 5.0.2. There's a few others but you get the gist.