I have the blue/purple Double Sens (contrary to the description on Bag Borrow it is actually supposed to be Iris/Bleu de Malte, not violette/indigo). I've looked at mine compared to yours and I do see some differences in terms of stitching that concern me. My stamp is also slightly different than yours. I've had and worn mine pretty much every work day since I got it (which was right after the bags came out, so I'm thinking three years in September?) and the leather does not look as wrinkled as some of the photos of that one.
The orange bag looks ok to me, but I have some doubts about the blue/purple one.
I would agree with mistikat. The construction and the stitching of the Orange/Gold combo look authentic in my opinion.
The other combo is not authentic in my view, the stitching, stamping and termination is not consistent with an authentic product.
Thank you very very much. I really appreciate your help.