You didn't plan to, but you still came back and you can't leave anyway since I locked the front door of Ur. Then I changed the shape of the key with a Keycutter Tonic, smelt it, made ingots out of it, and I donated them to a Rook shrine!
Welcome back! Good luck with your floor! Let me know if you'd like some help and/or storage display boxes to square away some of your...ahem..."collection".
Happy glitching! :P