All my buns are free-roam and potty-trained! Sure there might be some stray poops sometimes, especially when something startles them, but I'd say they're great 97% of the time. Spaying/neutering them helps a lot.

When I find a lot of poop outside their litter box (most of the time in one neat stack), it usually means they're angry at me. Food is late, litter box is too dirty, there is too much noise outside (somehow this is my fault)... haha.