Just came across our old conversation and was wondering if you found anything out in France regarding Jean Boubion. All of my most recent research seems to point to his origin being around the area of Salies de Bearn, vPyrenees Atlantiques,France. I say that because I found another Jean Boubion (relative or Jean himself??) in that area that fathered a daughter in 1841, but no definitive proof of an actual connection versus conjecture.
Also, I know our grandparents mentioned the Basque in association with Jean Boubion, and Salies de Bearn is in that area of Basque country, but it's not clear if he was Basque, or just sailed out of Bayonne which was in Basque territory. It's hard to say because other Boubions show up near Paris a hundred years earlier.
PS. I looked through my old emails and couldn't find any chain of our having spoke. It's g (or g_) last name at yahoo.com