You used to see Altoids tins used for project boxes for everything imaginable, but since 3D printers became widespread, it’s extremely rare to see the tins used for projects anymore. I know a a lot of people in the makerspace who would only buy Altoids to use the tins afterward for their projects. Now, they just 3D print a custom case.
I don’t know how much it costs to print a tin like that (e.g. in materials), but you can buy plain tins fairly cheap.