not knowing what type of auction you are referring to.....
but, since most of these are RCI guest exchanges, you would probably have to put the request to the resort where you have won the auction
for ready set go, your name does not go into the resorts computer until approximately 3 or 4 days ahead, it appears as MHI on our "Guest Certificate"
sorta a catch 22 , but once the auction is won you should be able to email them to see what they can do for you