Kudos to the DLR Reservation Staff
It was my fault; I'd looked at the reservation a couple of times, but never close enough to recognize the mistake until now--I'd booked the reservation for three nights at GCH, and we needed four (the day we take our personal E-ticket down, we're going to just relax by the pool).
Unfortunately, I was right at the 3-week mark when they send out the package.
Once again, the staff at the Vacation Planning/Travel group came through in a superior fashion, even allowing me to avoid the penalty fees I was initially going to incur, and making some special arrangements as far as the new documentation.
Not that any other entity might not have done the same; but the people at WD Travel are about the nicest people I've ever had the occasion to deal with. So I thought it was aopropriate to thank them here--especially Karen, Marla and Toni (in case you ever run into them).