Eileen Fisher Canoe 2 Leather Platform Flats Size 7

Bought these from a local consignment store but they wound up being a tad too big for me and my heel slips out (I think they run a touch big for a size 7). I've never worn them outside of my apartment, and from the soles it looks like they've never been worn by the original seller either. Two small marks/spots I can't get out on the left shoe (one near the toe and one near the heel) — see last 2 photos.