Claire's one is a different leather, and it has this piping seam on the edged that keeps the bag in shape. My plastic Birkin dupe looked like the one Claire has. I'm not versed enough in Birkins to say if every model has this piping or only the ones that should stay stiff?I don't understand how Sellier or Lydia can get away with saying her Birkin is brand new 2020 never used. I just watched Claire's first Birkin unboxing to compare and even though they are different sizes and leathers and this affects how the bag looks, you just can see how a real new Birkin looks, and it clearly is not how Lydia's does...
I don't know if it's Sellier or Lydia who's lying, but If I was her I'd be more transparent about it. Maybe it's true and it hasn't been used but it's been stored incorrectly for a while and that's why it looks a bit saggy, but anyway, I would have talked about it instead of insisting constantly on the fact that's 'brand new never worn'.
Pics for comparison:
Compared to Claire's Lydia's looks cheap. It lacks the stiff frame.