First one is looking down one of the seatposts
Second is down the top of the fork
Last two are random shots of inside the Black Inc bars.
All these photos look super clean. I'm no expert but I really don't see how anyone could say it's not well built, given we're not talking spaceships, rockets (or submarines).
If the whole frame is like that, if the weight checks out, if wall thicknesses are consistent, if round holes are round and so on, I guess this seller does sell a quality product, albeit a counterfeit.