MOB or Evening Dress

I have a brand new MOB dress. I ordered a few dresses and went with one dress, totally forgetting I had ordered this one. By the time as I was ready to return it, I exceeded the return deadline. This dress is navy blue, size 16. It is still in the original packaging and box. It has not been altered. Since I only have one child, need to sell this dress and make another mother beautiful on their childs' big day. Asking $280 plus shipping. I have the time to express mail it if necessary. Will mail once payment is received via certified check.