To be honest, this is one of the most difficult areas to call, because this is where the most physical pushing occurs. B is usually inside A and putting a lot of back pressure to maintain some rebounding position, A is working to get around B, usually in a very physical fashion. Only the most egregious displacement gets called in my experieince, and that's how it should be.
As for boxing out legally, the most common problem is not usually displacement. It is lack of foot movement to maintain inside position, necessitating use of the arm to restrict an opponent's movements. When a player is inside and gets the foul, it is frequently for holding an opponent and preventing him from moving past because the inside player didn't move to maintain position.
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