As most of us get older, we discover our memory is not as sharp as it used to be. Its a pain, but there is a minor upside. Now we can hide our own Easter Eggs!
This actually happened when I was a kid. We thought we had found all the eggs, but we missed one. It had original been hidden between two couch cushions, but it slipping inside the couch frame. Appox 1 week later we began to smell it, but we didn't find the egg for several weeks.