Wandering Aramean posted that United is doing a 25% PQM bonus for BOS-NRT fares, so I looked a bit and found this, which is 32,016 PQMs before bonus, 39,803 after the bonus. Unfortunately I can't do it because of another trip, but maybe someone else can.
That last one, NRT-IAD-BOS-ORD is two fares, the TYO-BOS fare and a BOS-ORD fare, so that should be valid for the promotion, but I'm not positive.