Last night, on my main character (Titan) that I carried over from D1, after defeating Calus, and going to the underbelly to redeem the keys, I noticed that all of my keys were missing when I went to open the chest. I discovered that all of my keys had been removed, while the rest of the people in my fireteam, had them. Upon taking a look at the last 30 minutes of video I saved, I also discovered that I didn't receive a key after defeating Calus. I have not created any new characters, as all of my characters were carried over from D1. After defeating Calus, we went down to open the chest, then went back to the start of the Raid to access the underbelly. Though, it would be nice if I could get those keys back, I'm more concerned that this may be a common occurrence, and fear that it may happen again on a different character if I attempt the Raid again this week (which, more than likely, I will do). It's a shame to spend all that time and energy on the Raid, only to have your rewards rescinded from you before you could redeem them, then watch as everyone on your fireteam get exotic and legendary engrams in the underbelly.