Shatasha
I still think somebody else checked it before me. It appeared if the ashes had already been disturbed, and I doubt it was Sitwell himself. I was going to question the roommate, but I have no idea who it is or where they might be.
Are there any other words that it might be part of?
... Yes, it appears he met Kobik. But I can't imagine why he'd write down her name. Maybe he was keeping her as a potential suspect for showing up in the wrong place at the wrong time.