Unfortunately it did, twice in the first month I had my first snake. Despite having screen clips, he still got out once. So I added more screen clips (had five on a 20 gal) and he got out a second time. He was then moved to a "snake proof" enclosure I built. I don't really feel like I "let" it happen considering I was doing everything I thought I was supposed to be doing with a single snake in a glass terrarium.
I'm glad you upgraded your security. He sounds crafty.
KMG
0.1 BP 1.1 Blood Python 1.0 Brazilian Rainbow Boa 1.0 Aru Green Tree Python
0.1 Emerald Tree Boa 0.1 Dumeril Boa 0.1 Carpet Python 0.1 Central American Boa
0.1 Brooks Kingsnake 0.1 Speckled Kingsnake 1.0 Western Hognose
0.1 Blonde Madagascar Hognose 1.0 Columbian Boa