I've never had a corn escape, but I've had plenty of escapees.... Here are a few of my stories...
Jester was the first to escape, I thought I closed the lid tightly on his cage, but didn't. HE climbed into bed with hubby and I and we had a surprise at 4 am when I realized he was n the bed! He escaped one other time, again the lid wasn't on tight, and I woke up in the morning and he was hanging out of the bathroom toilet.
Bishop only escaped once, found him on a wall ornament, about seven feet off the ground, trying to reach the ceiling.
Got some wild caught ball pythons, had the five non-feeders in one tank, two escaped. One showed up in the middle of the bathroom floor.
Lost several hatchling snakes from a substandard hatchling rack I spent a fortune on, luckily they were mostly all found in the vicinity... one was found outside in the grass. Two are still at large.
Got a beautiful 50-50 cal king, she escaped out of a hole in the lid of the brand new reptile cage we'd purchased for her. Didn't notice the lid had a hole for a cord... she slipped right through and was never found. We've since moved so she is lost forever. Before we moved I did find two or three shed skins, some super fresh, but never actually found the snake.
When I stopped putting hatchlings in the hatchling half of my defunct rack, I pulled out the boxes, later found out that that loosened the top of the juvie boxes, had two juvie cal kings escape from those. Found one slithering in the kitchen, the other slithering in the bedroom. Luckily we found them before they found each other!
Had my Pyro escape twice, once I happened to be looking at her cage and saw her plop to the ground, second time I found her the next day on a mouse cage looking longingly down at the mice inside.
Worst part about moving with snakes, is working to get them all set up again. And we had to move at the beginning of a school year, with hubby a coach in a fall sport at the high school, and me his unofficial assistant coach. Made the mistake also of tripping and falling on one of our glass aquariums right then.... broke my foot, and lacerated my butt! Life sure throws some curves! But, except for the two hatchling kings, and the one WC ball python, all who got loose in the new house are accounted for. We don't mention the loose snakes to visitors.
I've been remarkably lucky with my corns though. They love to visit people, but don't seem inclined to escape.