Antique Lantern
Anything that’s old and made of rusted metal is definitely worth keeping. Well, unless it’s an old shovel, or an old spatula, or an old spoon, or an old anything, pretty much. Heck, you could have an antique rusted-over war helmet, and nobody would give it a second glance. So, yeah, you should definitely check on whether the rusted piece of garbage is valuable or not before tossing it away.
This person did just that. They learned that they had an antique lantern in their possession—one of those old lamps that you filled with kerosene that serve as both a way of illuminating dark spaces and burning your house down.