Welcome!
It does sound like a binky. If she was moving around like popcorn and twisting her body mid-air, jumping then landing facing the other way, shaking her head and ears – then this is binkying. And given you said she is the energetic bunny, I’m not surprised she was doing the binkying. Binkies are great to see – especially from baby bunnies. This is a bunny named Billy showing some binkies. Is this similar to what your bunny was doing?
The litter box moving is normal. She does sound like she’s a busy girl, arranging and decorating. It’s probably her way of entertaining herself. If she’s moving it and pottying behind it, she’s showing an adversion to her box. She may want it placed somewhere else in her cage. If it’s a problem, you can try fix the box in place. Pop 2 holes in the side and wire it to the cage side. Or devise another way to fix it in place.
I just wanted to add that alot of rabbits are mis-sexed – so I encourage you get your 2 checked by a vet to determine they actually are 2 girls.