Ok, here are the "After" photos of my Cobble Hill Little Minka... I got the crease out (there's a hint of it left on the bag, but very hard to see). This is what I did to remove it:
1) I removed paper stuffing and over-stuffed it with fluffy hand towels. Especially focusing on puffing out the area where the crease was. I also stuffed a smaller folded towel inside the front flap, where the crease began on top.
2) I conditioned the leather with Kate Spade leather conditioner.
3) I hung the handbag on the door hook inside the bathroom (a large hook where I normally hang my robe).
4) I turned on the water in the shower as hot as I could handle on my skin. Then closed the door and window, with the handbag inside the bathroom, and showered for 10-15 minutes. (Obviously you can do this without taking a shower, but I live in California and don't want to waste water, so I did). 15 minutes of steam is what was recommended in the article I read, by the way.
5) After my shower (and drying off) I immediately 'smoothed' the crease out with my hands. I did this from the inside of the handbag, focusing on the area where the crease was-- and then from the outside as well. Then I left the towels inside and hung it in my closet for 2-3 days. Voila!
(Note: I have a very small bathroom where it's easy to trap steam. It may not work in one of those large, open ensuite master bathrooms...)
Here are the results:
