The guy who stole 200 moon rocks from Johnson Space Center to have sex with his girlfriend on top of them still making it into NASA audits that basically say we have no idea where over 500 moon samples went between 1970-2010.
NASA has been experiencing loss of astromaterials since lunar samples were first returned by Apollo missions. In addition to the Mount Cuba disk, NASA confirmed that 516 other loaned astromaterials have been lost or stolen between 1970 and June 2010, including 18 lunar samples reported lost by a researcher in 2010 and 218 lunar and meteorite samples stolen from a researcher at Johnson in 2002, but since recovered. (via)
Favorite quote from the whole pdf:
..we learned of one researcher who still had lunar samples he had borrowed 35 years ago on which he had never conducted research.
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