Can I ask a silly question? You mentioned above that it will be more pliable with use. How much softer or flexible can a box Kelly get? I have one from 2004 and hardly use it. I know that's sad and a tragedy but part of the reason I don't wear it more is because it's so stiff and can't carry much but I don't want to let it go because it was my first H bag. I didn't realize it could get a lot softer.
Can someone enlighten me? Sorry this is slightly off topic.
I wouldn't say that box ever gets soft, but the side panels unfold a bit more easily once the leather has broken in a bit, making it easier to open the bag wide. My 2010 box Birkin was purchased brand new, and it took a bit of work to unstrap it and tuck the flap in the first few times. Now that I've used it (sparingly) for 4 years, it's much less of a struggle to open it up wide, which makes it easier to use. In comparison, I can open and close my 1979 Kelly with no trouble because the folds on the side panels are much less stiff. But I definitely can't batwing the sides. I'm not sure if I'm describing it well..hope it makes sense!