Join Date: Mar 2010
Location: Ontario, Canada
I don't know if cat attract products are also effective for pooping outside of the box.
Setting aside an unclean box and similar litter box issues, I only know of three reasons for a cat defacating outside litter box. The first is medical, and it's my understanding that medical issues are even more likely to be the cause when the issue is pooping outside of the box, rather than peeing. So, you might want to check that out. The second potential reason arises when a cat prefers to poop in one box and pee in another, but if you already have three boxes, perhaps that's not an issue. That said, you could try adding another box down the basement to see if doing so solves the problem. The third reason is stress and/or territorial issues. For either reason, you might see if you have any luck with Feliway.
I presume you have cleaned all of the relevant areas with an enzymatic cleaner, which needs to be used for poop as well as pee. If not, you should likely do that too.