It's long been accepted that if an inbounder throws the ball and the ball rebounds back towards the endline, it hit the back of the backboard. If the ball rebounds farther out onto the playing court, the ball hit the side (or bottom) of the backboard.
So, if I was sure the player was behind (closer to the endline than) the backboard, I'd have OOB on the OP.
Benefit of the doubt, though, goes to the player NOT being closer to the endline.
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