The roof of my father-in-law's garden shed happens to be made from the copper plates that were used to print those maps! He used to work for OS, and they threw

The roof of my father-in-law's garden shed happens to be made from the copper plates that were used to print those maps! He used to work for OS, and they threw all the plates out with the transition to digital printing. You can sit in the shed, look up and see mirrored engraved maps all over the ceiling. As far as I know he was legitimately given the plates as scrap, but I'm using a sock puppet to avoid any possibility of OS deciding that the plates are theirs after all and going after him.