The Golden Keyhole Breach

The marble stairs led me all the way down into the front lobby this morning! Standing tall on the polished terrazzo floor, I spotted a towering bank of brass mailboxes glinting like an armored fortress. One narrow rectangular flap hung slightly ajar, exposing a mysterious dark fissure. I leaped up, hooked my front paws over the cool metal edge, and peeked straight inside. Instead of a rival beast, I discovered a glossy postcard wedged in the slot. I gave the stiff paper a victorious nudge, claiming this high metallic cave for my territory!