I'd say this isn't quite like losing your keys...but it's similar:
The U.S. government has misplaced the original recording of the first moon landing, including astronaut Neil Armstrong's famous "one small step for man, one giant leap for mankind," a NASA spokesman said on Monday.
"We haven't seen them for quite a while. We've been looking for over a year and they haven't turned up," [NASA spokesman Grey] Hautaloma said.