Is your bunny neutered?
Even though neutered you will clean a bit of droppings spread here and there in the house. It’s a routine for me to clean up after my bucks every morning in the kitchen. I always find a trail of droppings leading to the hide house and on the roof one of my bunnies always love to leave a hearty present. I think he do it to mess with the other bunny, because that’s my other bunny sleeping place
Otherwise I will find droppings up on my bed and among the shoes. I always know which bunny have pooped, because they have their spots where they leave 1 to 10 droppings. For example one bunny love to binky on my bed it will always end up with droppings being scattered while the other love sleeping near the shoes and leave droppings at that spot.
What we say litter trained is when they always urinate in the litter box, droppings will never truly be 100% in the litter box. Specially when the bunny isn’t neutered or spayed.