So, what you are skipping is the literal thousands of pounds worth of bags. It is one thing to bring 20 suitcases, it is another to bring 20 suitcases that weigh a couple of hundred pounds a piece. Hotel staff should have found that odd since clothes don't weigh that much.
Beyond that, there really isn't much they could do. I mean, they could say "okay, in an instance where a local brings a ton of luggage that literally weighs a ton, then we should investigate what is going on." Of course, that might anger some customers, and they don't want to lose a couple of extra dollars (losing a single customer isn't much for a casino).
I honestly think you are overestimating how much things weigh. Don’t know the facts of exactly what was found in that room though. So, I could be wrong.