Sentence 1: The mailman gave me a small package. 
 Sentence 3: There was a large knife and a gun inside 
 Sentence 4:  When no one was looking, I decided to take it home 
 Sentence 5:  Eventually, I was able to contact the owner 
 Option 1: gave me a small package. 
 Option 2: Even though I can't recall ordering anything, I opened the box.