I don't know exactly but the main thing is don't get too upset. I'm sure things can be set right. You should probably, without too much hesitation, contact the buyer and explain. People are generally forgiving. I don't know much about Ebay but you could maybe contact them as well and explain so you don't have your rating affected. Just don't let this ruin your peace of mind. Some-one with knowledge on this will probably wake up soon and give you the proper advice that I can't. I wish I could though.