15 huge boxes? no not many people will do that for you. and transporting them through fedex will be expensive. stick as many as you can in your car and drive them back otherwise it will cut into your profit
Send them in care of yourself to one of the many mailboxes or parcel post stores (FedEx Kinkos, UPS, etc.) The delivery truck already goes there and they ll have the space. Why not send to an acquaintance in TX? Use the spare bedroom or garage for a day, buy them dinner for the trouble and head out?