fyi. when you win an auction, the winner has to put in their address in order for you to mail it to them. it must be a verified address. this protects you, the lister so that you aren't sending it it somone fraudulent. (saw your update about messaging you the mailing address).
once the auction ends, it will prompt the winner to fill in their address. sometimes it take a few minutes. sometimes ppl bid and put in a really high bid and they are not physically at their computer when the auction ends, so they won't input their info right away.