They can edit within a certain time frame and just replace the text.
Anyway. I think what needed to be said has been said. People can choose to take advice, they aren't required to follow your directions. Although that might probably be the better decision, we can't make anyone do something.
Just let it go.. You don't need to keep rephrasing your point. The point has been made.
I hope the snake is found safely! They usually don't travel too far. I would keep checking every nook and cranny every night if you can. He might move around. Get down on the ground and pretend you are a snake.
I remember there being some sort of cabinet that you can't get into. Is it possible to get a small camera in the hole to take some pictures? Maybe if you can find where the snake is it would help.
If you think he might have gone further than your classroom, I would start checking other nearby rooms.