Sentence 1: Bob gets ready to leave. 
 Sentence 3: After searching his entire house he still can't find it 
 Sentence 4:  He calls the police to see if anybody has turned it in 
 Sentence 5:  Bob is relieved when the officer tells him his wallet had been found 
 Option 1: Bob counts the money in his wallet. 
 Option 2: But he realizes that he can't find his wallet.