Trace has come to work ever since I got him. He thinks everyone that comes in the door is there to see him

Sometimes if he is napping hard and someone comes in and starles him....he goes running and howling from under my desk. That lasts maybe 1 minute before he gets all wiggly as if to say...."oh, sorry, I didn't know it was you".
PS We no longer need a paper shredder, we have Trace....LOL