So Question on the gallery unlocking element, is there a set amount per 'level' or is it completely random, because I feel like I did level 8, found two, failed to complete the night (which i assume means i dont keep them) check the gallery just incase and yeah nothing, so i go back in, I dont find any anywhere no matter how hard I look and complete the night, no new additions, I even went back through a third time on the same difficulty and still nothing.
TL;DR - Is there an actual rule to the appearance of the objects and I'm just missing them, or is it complete RNG on whether or not they show up and difficulty/level doesnt matter?