Setting up the tanks like you did is a good plan. Snakes, especially balls, don't usually wander too far when they get out. Would the janitors mind if you left some flour on the floor of your classroom overnight in case he's on the move? You can also ask the students to just keep an eye out in the classroom, as long as none of them will freak out about it. He probably won't come out during the day when there's so much noise though.
My girl's gotten loose a couple times in my hoarder-mom's basement (my walls are made of sheets, lol, not exactly snake-proof), and even she's come wandering back after a few days, I just kept a water dish near the space heater, both times I found her just hanging out and getting a drink.
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