I read the responses and now have some serious suspicions:
1. The same question about conservatories as with Maretti – how did he know about 3+ cons?
"I knew that the first con has more than 3 angels."

2. Regarding the moment when he visited the library and left with loot from a treasure zone, I had a different explanation, and I remember this save very well (Gomunculus provided screenshots).
/topic/at/584408/
It is clear that Kir didn't open the treasure zone, but Thinkeer says that he left because there was nothing interesting.

Regarding the size of the conservatories, I strongly suspect that the Chinese have resident programs that allow them to display the size and contents of objects. For example, hovering over Utopia shows what artifacts are inside or hovering over a con reveals its size. Technically, this is already implemented; I’ve seen such programs and even own one. But my conscience doesn't allow me to use them…