It makes sense that we don't find anything that belongs to Astarion in the palace. The spawn don't have anything and he's not someone who would keep a journal. I'm pretty sure the clothes he wears are all he owns. It is disappointing that they didn't give him much to say in the city though. He should know all the shady places.

And it's funny that Leon's the one talking shit lol, he should try spending a year in solitary instead of his special room.

What I'd like to find out more about is why Cazador was obsessed with Astarion specifically.