I keep some cat toys in a cupboard. For example: Cat Dancer, and other toys on a string. Once Beau sat by the cupboard and
meowed. I opened the door and took out the closest toy. Beau just sat there. Then I went back and took out almost every toy in there. Beau just sat and looked at me until I took out the toy he wanted. Then he jumped down and wanted to play with it. The toy he was waiting for was one I had forgotten about, yet Beau knew just where it was.

Beau has also had toys (balls, mice, etc) under furniture. I can reach under and get several toys for him. Yet he is always waiting for a certain one.