I got the impression that I had explored the entire black-and-white location (including the forest) and the white space with monsters. But I don't remember if I interacted with the objects I found. Probably not, because they weren't highlighted in white in the inventory and don't sound like something that would fit at all. I think I should just take a break and continue to explore with a fresh head. (Btw, I thought there was some kind of sequence in where the garbage cans teleport to, or it depends on the volume of the music, lmao.)