Outside of Africa, the only place where Cape Clawless Otter are kept is at Ise Sea Paradise & Noichi Zoological Park in Japan. (The ones kept in captivity in the United States have probably disappeared.)
@captain alligator, unfortunately San Diego’s last individual passed away in 2020. I believe that a few others may have persisted slightly longer in other collections, but you are correct in thinking that all have since passed away.