Today, I checked on the mangosteens in the local supermarket (in China - the one in Asia) to see if I could identify where the out-of-season fruit was coming from. There was no indication. I asked the woman on the weigh station and she looked at me as if I was mad and said "China" . (I guess she meant the one in Asia.) But I suspect she would also say that if I asked her where the Spanish olives came from.
Anyway, they were looking past their best, so I passed on them for now.