Did he ever specify what species he thought it was? Bacupari is a name given to multiple different species in the genus, including g. intermedia. The fruit looks like lemon drop to me
Raul called G.brasiliensis.
You definated have a Garcinia Intermedia.
There is confusion Between Garcinia Intermedia and Garcinia Brasiliensis. They both get called 'Lemon Drop Mangosteen'. After watching a few two many Flying Fox Fruits videos, I've come to an understanding of what's what.
Garcinia Intermedia (Called Madrono here in AUZ) is rounded.

Garcinia Brasiliensis (Also called Bacupari) is pointed.

The one in picture has a pretty long point, some have shorter 'tails'.
Hope I can clear things up!