I'm an LV Bag Newbie! Have admired for years but finally got my first one 4/10/07 (Mono Speedy 25). I've been reading as many posts as I can--you all are AMAZING and have so much LV knowledge and bags that make me drool. Anyway, now I think I should have gotten the 30 instead of the 25. I still have my sales receipt, can I return it and pay the difference and get the 30? Also, I've been sitting it near a window to accelerate the patina, does that matter? Thanks a bunch.