Corns are notorious escape artists, especially the babies! Lucky you found him/her twice now. Houdini is good choice for a name hahah!
I started out keeping mainly keeping corns (only have 2 now), they are great snakes and pretty easy to care for. I'll never forgive myself for losing a baby snow motely though, got out and never was found. So be careful and they really can squeeze out of very small holes, they don't give up and will keep trying.
A great sexing graphic from one of the corn snake masters Bill and Kathy Love:
http://www.cornutopia.com/Corn%20Uto...%20CAPTION.jpg
Good luck with your new little one!