Think it was just a glitch on the save file - or maybe I just needed to wait a day, whatever caused the issue resolved itself.
I'm curious if the tent serves a purpose after the initial "there was someone here", because both it and the chest next to it just stay there, even after I've looted the chest. I guess the chest is coded in a way that it'll stay there (given that others of the same type stay put), but the tent just feels oddly empty, like I should be able to do something with it.
Found it funny that the warden, after dealing with Furo one way or the other, apparently stays awake 24/7! Was that an oversight? (I was able to flirt with her at 2 in the morning!) Maybe after Furo is dealt with she starts drinking high-powered energy drinks!