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^^ Did the outlet tell you it was an "FS" item?
I agree that if you're uncomfortable with the seller, don't give him/her your money.
I would be more inclined to say that the seller should show via photos all flaws as opposed to knowing what FS means. For example, when I've sold my pre-loved bags on eBay, I'm SUPER careful to show all minor marks and call them out in my description.
I also tell people that if they have ANY doubt to please not bid. I want people to get a great deal and understand completely what they're buying.
For those that have the FS on their bags, where is it marked? I can find it nowhere.