Why not just get it from LV for the same price, and not have the worry about getting a fake one/used/lost in the mail/whatever? You can get the belt from their main website (just click on Men/Belts, and it's about halfway down). They'll even ship for free and you get the full customer service/returns/personalization/etc.
http://www.louisvuitton.com/us/flash...=home_entry_us To the OP; if you have the receipt, you can probably return it to the LV store. They generally are pretty good about accepting a return or an exchange for something else w/ receipt and if it is new. Barring that, Ebay will be your best bet to fetch a good price... but I don't think you'll ever get anything close to $575 for it (LV has decent resale, maybe even up to 70-80% retail... but I doubt you'll get 100% retail.) I think most people would rather just get it from LV online, for the same price.