There are no stickers on the screws to break (you know the ones that are placed there essentially to prove that you undid the screw)

And there are no electrical connections to the case to sense that you opened it.

I cant imagine that it could be proved you opened the case, supposing that youre not allowed to.

That said, i know from past experience that when there are problems bitmain support will direct you to re-seat electrical connections. Cant imagine that it would void anything, its just the case.

Im confident the case is there to look cool and improve airflow

go nuts