I'm watching the movie 妖猫传 (yāomāo zhuàn) = Legend of the Demon Cat. About 10 minutes into the movie, a man secretly enters a room named 御宬 (yùchéng) = "imperial storage" (I think) and searches for a hidden box. He reaches for the box:
I think this says something like:
meaning "pheonix perch building" (using a mix of traditional and simplified characters). He opens the box, and takes out a special key:
It looks like it says something like:
I don't know what this means. When he uses the key, he's almost killed by a trap.
I want to check I've correctly transcribed these two items, and ask what they mean. The first simply seems to be simply a fancy name of the room where the key is used.
Question: Does this box say 鳳栖樓 on its lid and 私人必死 inside, and what do they mean?