Slightly off topic, but this reminds me of an occasion some years ago when for reasons of tidiness I decide loosely to assemble an Aprilia gearbox I had acquired in bits, assured (as one always is) that it was "all there". It was around 20 years since I had been inside one, but I set to with a will.
Several hours, and many attempts, later, I gave in and started counting the components off against the Parts Manual. It was then, with close examination, I discovered that the "extra" gear for which I could find no home was marked Mowog, rather than Lancia.
It had indeed been all there......with an extra bonus.