The cabinet, I meant I didn't input the correct number! It wasn't a bug, my bad. Also, the art started disappearing after I got my checkpoint just before I did the cabinet. (When Rob kills me because I told him where I was, then I re-arrive just before that moment and get another shot at the cabinet.) And the art also disappears when I go up to confront Ozy Mandias, (I mean Oswald) , I don't know if that part was intentional or not.