Difference between Simple Past and Past Perfect

What is the difference in meaning between the two examples below?

1. 
   
   

   When she returned home from office, she was shocked to see that her husband and daughter were missing. (Simple Past)

   
   


2. 
   

   When she returned home from office, she was shocked to see that her husband and daughter had been missing. (Past Perfect)

   
   

FIRST QUESTION: For me example #1 gives only idea of Status of her missing husband and daughter and example #2 gives idea of completed action/situation of missing husband and daughter before she reached home. Is this right?

SECOND QUESTION: Is example #2 past perfect or past perfect continuous?