Vermin Problem is a written note found Dishonored 2.
So awfully sorry to tell you this, but there's something each night been nibbling on some of your exhibits. The big one that looks like clouds and swine, if you'll pardon my untrained eye.
It's them rats in the walls. I sure hope nothing is ruined.
I don't know what they like so much about it to come back every night and eat more of it. I was wondering what it's made of, but whatever it is, it's tempting for the little bastards.