When my faince and I were at WDW in January he lost his retainer on a ride in Animal Kingdom. We had it narrowed down to three rides. (Please don't ask why he was carrying around his retainer! I don't know why he even still uses it!) We went to all three rides and they told us to check again the next morning. Well, anything found overnight is sent to their official Lost & Found near the kennels at the Transportation center near MK. We went the next day not expecting it & they had it! I couldn't beleive it! So, dont give up. If no one took it for themselves I'm sure they have it!