Bigger snakes are hard to lose.
I'll tell you a funny story.
I took one of my larger Rufous Beaked's out and I forgot to lock the front of the exo terra back and while I was in another room my little one must of pushed the glass door open and fell/crawled out. Well I put my bigger one back not having any idea the little one was out and about. I was walking to leave and when I stepped out of my room into the kitchen he was right there. It royally freaked me the flip out.