Simon: Money is shit to me. I would not give up McClane for all the gold in your Fort Knox.
Simon: Said Simple Simon to the pieman going to the fair, "Give me your pies... Or I'll cave your head in."
Zeus: What the hell's all this got to do with killing McClane?
Simon: Life has its little bonuses.
Chosen answer: He sees the reflection of his friend's badge number that he remembered from their conversation about the lottery earlier, so knows the badge was taken from his dead friend.
Captain Defenestrator