 They check how their new numbers compare to the numbers from the other house's box, which they wrote on the notepad earlier.Emily realizes that the numbers written on this notepad aren't the same numbers she wrote on the notepad earlier.When she asks other people, she finds that Lee and Beth are the only ones whose memory matches what's written on the notepad, because they're the only ones who haven't left the house since they wrote the numbers on the notepad.