I've really don't understand this all, carrying around a few hundred seems reasonable if you plan to buy or eat at random places, but otherwise if you plan to play in one or more casino's can't you just have the money wired, that way you are never carrying that much, don't need to put things in a safe box, you just need to have access to the internet in a casino to decide how much to move.
If someone gets access to you internet account...well be clever and have small ones setup for your fun!
Disclaimer: never been to LV, but computer scientist who knows about internet security