Authentic CHANEL capped toe slingbacks 4.5

Highly coveted Authentic CHANEL capped toe slingbacks 4.5 in beige and black. I got this last month but unfortunately it half a size bigger. I am usually a size 4 (its a struggle to find) and i would have exchanged it but I want to see if I can sell it for what I have paid for plus poshmark fees. I think this would fit a size 5 narrowish feet. No lowballs pls. I can still return this and get my money.