The Magic Cakes Puzzle

The Puzzle:

The Magic Cakes
In Hungry Horace's kitchen there were three tins. Each tin contained three delicious cakes:

One night Horace crept into the kitchen, opened the three tins, and ate three of the cakes.

The surprising thing was, when Horace went back to bed, each tin still contained three cakes.

How did he do it? Were they REALLY magic cakes?
Do you have the answer? Check against our solution!