If you are on a ride and the CM tell you to stow your bags in the provided pouch or container on the ride DO IT! I made the mistake of thinking I could hold onto it tight enough. We this bag had all our things in it including our park passes. We were at AK in Dino land. We had to go back to the ride at the end of the day at when the park closed. This had to be when they shut down the ride for the day. I walked threw the place with the CM. They turned on the lights for this. We found it right at the foot of the stegasourus.
I'm sorry you lost your bag, but that must have been very cool to be able to walk through there with the lights on. I am assuming they didn't allow you to take pics.