I'm not into conspiracy theories, but this is going to argue in favor of people who think Mankind never landed on the moon, and everything that happened in 1969 was staged and fake (remember the film Capricorn One?)
They don't want us to analyze the missing tape, they must have something to hide ;-)
Apollo 11 TV Tapes Go Missing: "Richard W.M. Jones writes 'On July 21st 1969, Honeysuckle Creek observatory brought us the first TV pictures of men on the moon. The original signals were recorded on high quality slow-scan TV (SSTV) tapes. What was released to the TV networks was reduced to lower quality commercial TV standards. Unfortunately John Sarkissian of Parkes Observatory Australia reports that 698 of the 700 boxes of original tapes have gone missing [warning: large PDF] from the U.S. National Archives. Even more worryingly, the last place on earth which can actually read these tapes is scheduled to close in October this year. The PDF contains interesting comparisons which show that if all you've seen are the TV pictures from the landing, you really haven't seen the first moon walk in its full glory.'
And for the fun, below is a comment from Slashdot :
"Holy crap, They were labeled "Moonwalk" so I thought they were the michael jackson video or something and I taped the world cup games over them. My bad guys. Can't you set up the studio in the desert and tape them again?"