Shoe thief, step forward!

There’s a shoe thief at the company! The company that owns the school I work for is a semiconductor manufacturing company. When you visit headquarters, you have to put on blue shoe covers or wear company-issued indoor shoes. I have a shoe locker where I keep my indoor shoes. I visit the company once every 6-8 weeks to take out money or check my bank balance because I can’t figure out how to sign up to see my statements online. I came back from shopping today and went to my locker to find my shoes missing! Empty! Nothing! Nil! The locker was locked, who stole my shoes?! Time to get a new pair from the 5th floor.