I bought several from Simon Jackson some years ago now, but he doesn’t stock them anymore. He does, however, have smaller Saint-Claude hinged boxes which will last a lifetime if opened correctly (so as not to damage the hinge) or dropped on a hard surface. I expect many here have one or more of these boxes. Unfortunately he doesn’t have any metal ended ones.
https://mysmokingshop.co.uk/snuff-accessories/snuff-boxes?page=2
Another popular box which many here will possess are those made by Michael Fisher of Heartwood Creations in Illinois (not the magnetic effort). The sliding lid is a good tight fit and is snuff-proof. For me, this is the minimum size for a snuffbox and when filled will last me a day.
Apologies in advance if you already possess any of these popular boxes.