We're staying at POFQ before a Royal Caribbean cruise this August, then returning to WDW and staying at CS. Is there any conceivable way we can store a bag or two on property during the cruise?
I know that you can pre-ship materials to be held for your stay (I have a friend who had medications shipped and held in the refrigerator for the week before she arrived), so I don't think there would be a problem holding a suitcase.
Best thing to do is call and ask at CS. They would be able to tell you if it is possible and what to do.
Keep in mind that CS is a convention resort. So they may charge fees to do things such as receive shipments, as they cannot differentiate between a normal guest, and a conventioneer. So they may be willing, but there may be a charge.