Zuma was, I believe, legitimately from Argentina. I've searched the newspapers, and he wasn't anywhere in the US or Canada at the time. Perhaps he just went back home. The Zuma name was known around the country, so I don't see there was any benefit of him wrestling under a mask for 4 years.
Thanks for the reply. I'm trying to solve a real, actual mystery (the identity of a masked wrestler; there's more to the story but I'm being intentionally vague), and Zuma's name came up as a long-shot possibility so I'm trying to get proof of his whereabouts so I can exclude him.