Bumpy was neutered about 6 months ago. He does not leave any droppings anywhere in the house, EXCEPT in “his area”. I’d say he’s 95% using his litterbox for poop, maybe a little more. I’ve witnessed him eating hay in his box, see the dogs walking off or me walking in his general direction, and fly out of the litterbox (STILL MUNCHING HAY), poo balls popping out after him, and run up on us to see what he can get. So for all I know, he could be 100%, but easily distracted?
I know when I used to use the dustpan in his area to try and keep it tidy, I would find myself doing it a few times a day. I eventually began to lose my OCD about it, and slowed to once a day.. every other day. Whenever. What I found was the poop wasn’t piling up, yes it was there, but not really MORE. So! I don’t know if he was beginning to poop less because of the neuter and waning of the hormones, maturing, or because the poops he was leaving around were staying there and he felt no need to re-mark.
Remembering your previous posts, I’m guessing you will probably always have a few scattered in that general area, but maybe a little less with more time passing post-neuter.