Please clarify what you did. Because returning to USPS does not immediately trigger a refund. Did you file a case through eBay, item not as described and seller sent you a label at their cost in order for you to return the item, if so, once the item shows received it will be refunded to you. Since you are covered with eBays money back guaranteed.
Did you send the item, at your own cost to seller, no case filed through eBay, then you are not protected with eBay's money back guaranteed, hopefully seller will refund you upon receipt of item.
When asking questions, its always good to provide all details, you have given us nothing, and we can't really guide you properly unless you are more forthcoming with your quandry.
