I reckon they could be part of something larger, but God knows what, I wish I could think of an answer for you. In an old electrical fire, once the metal rots away, you may be left with bits of brass switching and funny shaped fire bricks that may look odd and look like no relation to original purpose. Fire bricks from a grate or range/Aga? Segments from a stone washboard, internal heat retention from an old gas iron? I am not saying it is any of these just trying to think out of the box.