Awww, definitely contact WDW merchandising or Pop century. They can charge over the phone and mail it out to you. I lost dd4's tiara on day 2 of our vacation at EPCOT. Of course nobody ever turned it in, those small tiaras were sold out all over MK the next few days. Finally went to DTD just to find another one for her. So I bought her a tiara twice, to only have 1. Yep, I feel for you!
BTW, I was quite annoyed that nobody turned the tiara in to Lost and Found. It was sitting on a wall, not on a garbage can.