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It just came to me why the casino might be quiet, or waylay a security guard, or lose a few security tapes.
Suppose there was a tape showing Paddock packing a cannon or a gun case into the casino.
and suppose that tape was date stamped to several hours before the murder spree.
Guess who is on the hook for a Chapter 7 level string of lawsuits? The Mandalay Bay casino is worried about being sued for 800 or so counts of negligence, each in the millions of dollars, for allowing a guy to pack 25 guns through the lobby. This probably explains much of the wierdness of the case.