Why are they so stealthy?

At work today, the books came in droves.  Turn your head...*poof* twenty more books in the return bin.  Check those in and *poof* 50 more in the outside bins.  But, I swear, we never saw anyone turning them in!  I was run off my feet, and all hot and sweaty.

Shirt - Ellos
Jeans - Avenue
Scarf - Dollar Tree