Okay, so, the bad news is that the ones who found a key to get into Aquarius' room were Sylvain and Dimitri. [ they're dead. in case anyone missed it. ] They gave a summary, at least, but...

[ rip. this is bad summary. ]

The main details is that there were some items regarding wedding planning. Also, there was a journal that discussed events that matched things that happened at Camp Gatonina. And there was a dog.