By misshapen flap and wrinkle, do you mean the corners of the front flap of the Pochette Metis?
Cause mine wrinkled too - I bought mine in June 2020, brought it in to the store November and I said I don't think this is normal (referenced Instagram pics lol), and they exchanged it with a new one!
So lucky!!! I got the PM reverse with commercial wrappers literally my SA let me pick one out of 4 in stock. I sold it for the same price I bought it (neighbor bought it). My SA said all PM is like that?!? So I should've went to another store? Geez I feel like I've been cheated and could've exchanged it for a new one. So happy for you! Do you own an Alma BB?