I had a white Jett saddle that I had to bring back to the store. The only traces of use were under the rails, and they didn't mind. I used it for nearly two weeks (maybe 5-10 hours of riding?), including a clipless slow-timber fall on loose gravel (all the while thinking: "Oh my God the white saddle I hate it I want to bring it back I have to protect it in the fall!!!!!").

I hope your bike store is just as nice.