It doesn't look like water to me, did you notice this before purchasing?
Now my comments--I have 3 LV pre-loved bags from consignment sites. Any water spots have just blended in over time, this kind of thing doesn't bother me. What I am always looking for is tears or cracks in the mono canvas--that is the kiss of death for me. That large vachetta area is going to be hard to keep pristine, imo, so if you can't live with those spots and future spots on that area, you should return.