Okay, I have to ask the obvious question that seems to have escaped everyone else here.
WHO THE HECK IS DENYING THEIR EXISTENCE?!?
I mean, really. This isn't even on the so-crazy-it-must-be-true-conspiracies, like faked moon landings, and the Pentagon attack. This isn't even on the level of R.O.U.S.es (I don't believe they exist), 70%-Taco-Bell-beef, or the many ludicrous urban legends busted by the two-moustaches-a-token-Asian-and-a-pretty-redhead troupe. Denying the existence of moon boots is almost like covering your eyes and saying, "I'm invisible - none of you can see me!"