You know what this is. Your fingers brush the surface of the cigar-shaped object. If you're right... and yes, with a twist, it unscrews from the centre, and starts to hum and glow.
This is a jadescroll. There's a Shogunate seal on it, but that doesn't mean much; these things last forever. They can be at the centre of an exploding manse and will probably make it out intact. You seal it back up hastily, before anyone else can notice the light.
Honestly, you don't know what it is. But at the very least, you want your hands on a jadescroll. Even if its contents prove worthless, you can still wipe the text and use it yourself if you can get your hands on one of the pens. And if it doesn't prove worthless... well. It's practically criminal to leave it mouldering down here. Your eyes drift to the fire. Look at how poorly Yanbu kept her scrolls safe.
She'll try to stop you taking it out. It would be a breach of hospitality to take it. And right now, it's not like you can tuck it up your sleeves. Because you don't have sleeves.
Oh well. You are not leaving it behind.