Workers at the Brooklyn Bridge uncovered a Cold War era fallout shelter, complete with intact civil defense crackers:

The estimated 352,000 Civil Defense All-Purpose Survival Crackers are apparently still intact, said Joseph Vaccaro, a supervisor at the city Transportation Department. The metal water drums, each labeled "reuse as a commode," did not fare as well, and they are now empty.

This kind of thing is cooler than a planned time capsule, because the items stuffed inside aren't "artificial".