The cameras were only activated in the case of missing laptops and the school district says they never broke that policy.
It sounds to me like the kid reported the computer stolen and was caught using it. The "Improper behavior at home" is probably just how they could punish the kid within the framework of their student handbook.
Good point. The plaintiff lawyers are almost certainly doing this at least in part for a piece of the action and wouldn't bother unless they thought they had a case. If the family is putting up all the money, it would be, as you point out, not even vaguely worth it if the school's story is the truth.
On the other hand, you can imagine the fury of the parents if their story is true, that the school was randomly spying on the students and careless with what they saw. That would make it worth their while to put together such an effort.
It sounds to me like the kid reported the computer stolen and was caught using it. The "Improper behavior at home" is probably just how they could punish the kid within the framework of their student handbook.