--and I have seen it wondered why hotel personnel didn't "notice" the "arsenal"---I suspect it was probably because of a "Do Not Disturb" sign on the door--
I have no idea how the Mandalay hotel is set up, but if this guy was a regular and has residency, I know some hotels offer parking spaces in garages that you can take the elevator right to your floor without ever going through a common area.
So he had them in his trunk in golf bags/suitcases/duffels and waltzed right to his room.
It’s not that hard to believe.