I wouldn't use a plastic box, possible condensation if not dry, and outgassing from the plastic (think of a new car when, after a while, a film builds on the interior glass as the sun heats up the plastic trim releasing plasticisers, etc.).
If you must use a metal tin, something like the ammo can ^^^ sounds good.
I keep my stuff in either gadget bags for regular use items, or dry cupboard or drawer. And "collectable" items sometimes end up in the china cabinet, if my wife's not looking.