Sorry if someone got this already... but this seems pretty straightforward.
7-6 Article 2. "The thrower shall release the ball on a pass directly into the court, except as in 7-5-7 ("player may pass the ball along the end line to a teammate(s) outside the boundary"), within five seconds after the throw-in starts. The throw-in pass shall touch another player before going out of bounds untouched.
Back of the backboard is out of bounds, so a pass that hits the out of bounds backboard untouched is out of bounds untouched-- violation.
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