Have a funny story that's just like this...When I brought Bast home, she was nervous and scared, of course. I isolated her from the other cats in my bedroom with her own box and food, etc, and kept the door shut.
I was going to leave to run an errand, and wanted to make sure she was still doing okay in the bedroom. I went in, and called out to her, (usually she'll come right up to you if you call her), and nothing. I started looking everywhere...I mean everywhere! I have fostered kittens, so I know the crazy places cats can get into.
After a couple minutes and looking around over and over again...I started to panic...I was saying things to myself like, "I must have just imagined all this...She must not exsist. What is going on here?" I was starting to feel totally nuts, lol.
So, I left the room, made sure to close the door again, and grabbed Jack (another resident cat). Jack is very VERY smart, so I figured if anyone could find her, he could. I put him in the room and closed the door...Then came back a couple minutes later. He walked into the middle of the room and stared at me. I looked at him and asked, "Jack, where's the cat?"
He walked over to my TV ontop of my DVD player sitting on the floor and looked up at me, then at it. I walked over to where he was, and lo' & behold, there was Bast, hidden between the wall and TV. She's tiny and black, so no wonder I didn't see her.
Jack got several treats for that one, lol.