I realised that there is a camera on the 'Luxor' obelisk that is just down the road from the Mandalay Bay hotel, and directly opposite the concert area which was the target of the shooting. It might not show too much given that it was dark at the time of the shooting, but then, it may hide a secret or two with regards to comings and goings etc.

Image of the camera in context - https://imgoat.com/uploads/838023a778/50981.jpg

Image of camera zoomed-in - https://imgoat.com/uploads/838023a778/50980.jpg

Image depicting camera location in relation to concert venue - https://imgoat.com/uploads/838023a778/50983.jpg