I just saw someone wearing this exact bag in black while I was at the mall a little while ago but in black, so it can't be too old. Also, I'd check the outlet since it's a MFF style, it's priced quite high by the seller.
The is definitely the Cove Street Provence, which seems to be an outlet bag. I also think this seller has it priced way too high, especially if it is pre-owned. I think they're also using poshmark's format to misrepresent the original price of the bag because I googled it and it looks like the original retail price was $428, not $512. If you like this bag and are buying it pre-owned, you might be able to find a better price/seller than this one.