As you can see in those pictures the button top & white insulator disk has been added.
A piece of clear shrink tubing is used to secure the insulator disk to the top of the cell, or, the entire cell is re wrapped for a seamless look.
LG Chem does not manufacture button top cells.
Just me, authentic means as they come from the factory/original place of manufacture.
Fake?, who knows, if the cell has been fully re wrapped there is no way to be certain what cell is underneath it.
If a piece of clear has been used, I guess you can be reasonably sure...
Just me, only me, I would stick with AW or Orbtronics for button top 18650's.