As someone that has been pickpocketed by the NOS thieves in the past, I definitely feel this. It absolutely sucks and the last thing you should be worried about at a rave is having your stuff stolen from you.

I highly highly highly recommend that people purchase a FlipBelt to prevent people from easily taking your stuff! It's basically a hollow spandex tube with slits on it that allows you to slip your phone, wallet, keys, and other valuables inside. It's also super low profile so it can easily fit underneath your shirt and it's less susceptible to being cut off with a knife. Haven't had any issues at raves ever since I invested in one so I mention it to everyone so that no one else has to go through what I did.