Piano Secret Puzzle Box - Sequential Puzzle

Could have been fun

This puzzle arrived wrapped in such a way that it was truly protected and untouched. Even as I unwrapped it, it looked perfect. However, by no fault of the seller, it was practically solved already and the storage compartment was open without much puzzling on my end. Without trying to give away the puzzle for others, let us just say there must have been some manufacturing error that did not correctly lock the storage compartment. I reassembled it myself and and ensured it would require more than shaking to open. I got to see others try to solve it, but the joy of solving it myself was lost.