DAN (in a dead voice): It isn't mine.
BELSIZE: Not yours?
DAN: No.
BELSIZE: Oh?… Whose is it, then?
DAN: I dunno. It isn't mine.
OLIVIA stands at the sun-room door.
OLIVIA: I'm sorry, I thought … Why, inspector, what are you doing with my box?
BELSIZE: Yours?
OLIVIA: Yes! It's got all my letters in it!
BELSIZE: But it was in …