My two cents on the box jumps....box jumps might useful for a warm up or something, some small utility. But as far as transfer to dropping under a clean or snatch...idk...tallish box jumps you always jump forward to some degree, people usually curl their lumbar a little going up to the box...land in a little bit of a fetal position. Cleans you land with your back vertical, chest up. On paper they seem similar, but really going under the bar has a real different feel to it. The jump is different too the way and timing of extending your hips. I'd be careful with those.
I could see maybe doing box jumps to a short box just to work on explosiveness (short=you can put it close in front of you, don't have to jump out to it).
I have seen some programming Catalyst Athletics stuff where they do like a a fast/explosive triple back squat (say 65%)...them immediately transition into 3 shallow (short) box jumps.....RFD , blah blah....I tried that, meh...might go back to it sometime