Seriously, does no one read the real source.
If you did you would realize they thought it was an explosive device because cameras caught someone wearing a black costume go inside.
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That was the video they saw of him leaving the building after leaving the concealed box behind.
I don't know how someone wouldn't think this would cause problems as it was beyond suspicious and somewhat stupid to put the prank where there is nothing, but cameras. Anyways, I don't think he deserves 8 years in jail or even 2. I say he should be responsible for the debt collected, be forced to do community service, and gets at most suspended from school for a week. After all without a previous record I don't think he deserves any harsher punishment.