Bastards...this is one of the reasons that I never tip the bloody maid.
Unfortunately this one won't be easy. Options....
1) Eat the loss.
2) Sue the hell out of the place.
3) Insurance??
4) Keep calling the cops.
5) Set up your own sting, O.J. style. After you find somebody trying to sell your stuff, arrange to meet them back at the hotel to buy it. Get a gun (which is probably pretty easy to do in a place like Mississippi), and burst into the room screaming ""Don't let nobody out of this room. Motherf*&%er, you think you can steal my shit and sell it?" Then you grab your stuff, run out of the room, and go back to trying to find the real killers.
Oh wait, forget that last part...wrong case.
Good luck!