*LOL* Sorry, I shouldn't laugh, but that just sounds so much like my cat. He is a total indoor cat (Our choice not his I assure). He is always trying to sneak out, so mass panic erupts when he does disappear and he is less than inclined to re-appear when called.

One time, while we had a house sitter, he pulled this stunt. The house sitter looked and looked and looked. The cat eventually surfaced from under a blanket, in the CLOSED wardrobe....he'd opened the door, got in, the door had shut and there he stayed until he was ready and then he pushed open the door and came out.