I'm sort of at a loss here.
Here's my back story.

The clinic I work at had a young cat (maybe 4-5 months old) in October. He was found in a snowbank, near death. We nursed him back to health. He was infested with many internal parasites (coccidia, giardia, etc).
From the first day he came into our clinic, he never used his litterbox to do his #2. He's always peed in it, but he almost never poops in it.

He has lived in the clinic since October. His kennel isn't very big, and he seems very indiscriminate as to where he goes - more than once I've seen him go beside his food dish.

He's basically unadoptable, and the idea of euthanasia has come along more than once, for his own good. He's far too timid to be a barn cat.

I went out on a limb in hopes that maybe if he was in a house setting (as he has never had that luxury that we know), he would be better. So I took him home.

Sadly, it doesn't seem to have worked. I sat here and watched him defecate about two feet away from the litterbox.

I'm sort of at a loss. Granted, it's only once, but given his previous history, it seems no different than how it was at the clinic.

Does anyone have any insight?

I had a male cat that did that, Sadly He was my husbands cat and as long as my husband cleaned up after him He stayed. We just lost him recently. He never used the litter box to poo. All my other cats do however. Maybe if you had a bossy female cat to keep him in line that might work. Females don't like poo around. Keep up the hope my husband loved a cat that no one else did. Some one may not mind his bad habit.