Clue by Clue: Absentee Award Solution
The man had stopped going to work. He worked alone and no one seemed to need him. So he started staying home. That’s why he never answered his office mail or his office telephone! The government figured it out when they realized he only answered mail sent to his house!
FUN FACT: This mystery is based on a true story Man Skipped Work For 6 Years And No One Noticed Until He Won An Award