Gorgeous bag. We are bag twins. It's such a classic flap with long waiting list. The crease seem fine to me. The size is great on you. I'm 5'2" and have it wear double straps. I love the size and color. It's such as gorgeous for summer. It's one of my work horse. Keep it. I'm not sure how long you have to wait to find another one.
The dent is likely from the contact with the chain and it should go away. This is such a gorgeous bag; I prefer this particular color in the M/L size, but you cannot go wrong with the jumbo. Both M/L and jumbo sizes are good for you IMO.
Gorgeous Bag, I think the size Is Ok for u, & Crease Looks Normal But Not the Dent