On June 15, 1957 a Plymouth Belvedere was buried in Tulsa, Oklahoma. The car was to serve as a time capsule which would be opened in 2007. Among other things, it was packed with films, a commemorative plate and gasoline (in case the people of 2007 didn't have any to start the car).
The June 8, 1957 Victoria Advocate (Victoria, Texas) ran an article titled, "Oklahoma Really Whooping It Up For 50th Birthday."
In a steel vault, buried on the lawn before the City's modernistic skyscraper courthouse is a 1957 automobile and many another memento of Oklahoma's 50th year.
"Tulsarama!" visitors filled out cards predicting the city's population in 2007. Closest guess will win the car - 50 years from now - along with a $100 trust fund, plus interest. The money will be paid to the heirs of the guesser if he or she is not alive in the centennial year.
In June of 2007 they dug up the car. It was announced that Raymond Humbertson had, in 1957, submitted the guess (384,743) closest to Tulsa's 2007 population (382,457). Time did not treat the car so well, as evidenced by the photo below.
Mr. Humberston died in 1979. According to an AP story, his closest living heirs are two elderly sisters living in Maryland. It's not clear if they'll receive the trust fund money because according to the Tulsa World, it was "set up with Sooner Federal Savings and Loan Association, which was liquidated in the 1990s."
Be sure to check out the Flickr page of Michael Bates, who has some great photos of the unearthing.