My Treasure Box

Hello there, how are you? Are you in search of my box too? Well, you won't find it out there. You won't find it here. Maybe a little description? In my boxes' relation? It is full, But also so dull. It is broken in half, Worn in behalf, Of someone dear. But hidden year by year. It is shadowed by the many things. A metallic thump that rings. It is hollow, And very shallow. Do you know where this box is? Tell me, this is like a guessing quiz. If you know, that great! But when you know, don't hate. Thank you!