We used valet at Caesar's in Las Vegas for a week, we really had no choice. It worked out great as they ended up parking it in their Limo lot just in front of the entrance, it was the only other vehicle in there except for their stretch fleet. They had to keep one set of keys and we used the other to go in and out for day trips, they even gave us the code to get in the lot ourselves. We have also used valet parking for our B's at a few functions over the years and never had a problem. We have had problems with cars, one ending up with a big scratch, and the other instance they went through our console looking for cash, etc., they got about $25.00 out of it.
Nick