Sentence 1: Roger had a very large key ring full of various keys. 
 Sentence 3: After his passing, Roger's family tried to figure out all the keys 
 Sentence 4:  They found one very strange key that they finally fit to a safe 
 Sentence 5:  Inside the safe was thousands of dollars worth of gold 
 Option 1: After many years, Roger didn't even know what some of the keys were. 
 Option 2: Roger never found any use for the keys.