thanks for all the replies. i ended up calling it in, and you are correct about the WDW park merchandise being different from the store.
i gave them the item #s from my receipt and they generated a return merchandise number for me to include with a copy of my receipt when i send my stuff back. shipping back to them is on us, so be prepared for that. i have big items so not looking forward to that, but such is life. i'm also putting signature confirmation on my package and was told that someone at the warehouse will indeed be able to sign for it. hope this helps anyone else considering returning items in the future!