We brought the box to Mr. Black, our principal, the next morning and explained the situation to him. In the afternoon, at a surprise school assembly, he announced that the teachers will keep a look out for any more of these boxes every day, and that any student caught paying protection money will be severely punished.
That night, a picture of a young Mr. Black in a Halloween costume (which was of a character in some TV show that I had never heard of) was spread around via the Internet. Underneath the picture was a caption that read "DORK".
Surprisingly, the next day, Mr. Black gathered all the students in another school assembly and had the picture projected onto the big screen. "I am sure that most of you have already seen this picture. For those of you that haven't, this is a picture of me when I was younger, dressed up for Halloween. Two things you should all know. The first thing is that I am still extremely proud of that costume, and I have many great memories of spending that Halloween with my friends in that costume. And the second is that since I am your principal, any slightest insult against me will give me the right to punish you."
That somehow worked, and Mr. Black was able to keep on being principal without much trouble. The teachers started looking out for any more of those boxes, and any time one was found, they were confiscated swiftly. In fact, inspired by Mr. Black, the teachers started giving out assignments and tests again.
We had dealt a blow to whoever the mastermind was.