I know of a Chevy dealer that kept a 25th Anniversary Corvette for almost 30 years. They used to bring it out every year for the Homecoming parade, and it usually got towed back to the dealer because everything was dry rotted on it.
Burgunder Dodge outside of Pittsburgh had a first gen Viper in their showroom, maybe first or second production year, brand new. Lost it in a flood in 2004/05 and the big rumor going around was Jay Leno was in the works to purchase it before hand.
