If you were a tea drinker, you could use each compartment to hold different specialist tea bags. You know, English breakfast tea in No.1, Darjeeling in No.2, Assam in No.3, Earl Grey in No.4, etc. Then, you could impress your friends by asking them which tea they'd like, spin the combination dials to retrieve a tea bag, make their tea and dispose of the used tea bag through the letterbox. LOL.
Andy -- Old Chinese proverb say: If you think something can't be done, don't interrupt man who is doing it.