Maybe this is old news, but old electric panel covers will sell for WAY more than scrap value.
Here's what I recently ran into, and it's not an uncommon situation. Homeowner sells a house. Either a home inspector or an appraiser notices that the main service panel in the basement has no front cover. The closing is held up until the panel has a cover. Quite often, the whole panel gets replaced because the panel is old and no one makes a cover. The realtor just paid $20 for a used panel cover instead of $800 for a new panel upgrade.
Here's what you want to look for. Save the covers from panels that are no longer made at all, like Pushmatic, Federal Pacific or Wadsworth and the covers from older versions of common brands, like Square D, Cutler Hammer and Siemens. List them on Ebay for $15 or $25. It might take a little while to sell, but it's sure better than the $.20 you would get at the scrap yard.