I decided to return it. It was pretty bent up and I knew that if I couldn't fix it, I would never use it. Seller agreed to take it back.I think the steam is a good solution.
It is unacceptable for a seller to ship a bag in a way that allows it to get damaged. I had this happen to me and when I complained to the seller, she said I should file a claim with the post office, like the post office was responsible for her poor packing decision. She didn't even save any money by shipping it in an envelope - it would have been cheaper in a flat rate box, since it weighed 3 pounds. She was willing to take it back but never admitted fault, and I still wanted the bag so I gave her a negative for being rude.
I guess how you approach the seller depends on how much you want to keep the bag and the deal you got. Sometimes it just isn't worth the hassle. I just got a mini skinny that was sold as new with tags. The seller didn't show the back side where there are two ink smudges. It was only $19.99 and I can't get up the energy to bring it up.