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Do you feel that it is similar to "Garcinia speciosa" (or "Garcinia hombroniana") from Thailand?
The leaves of the seedlings from the seeds he has supplied as G.malaccensis are too narrow to be G.hombroniana or G.malaccensis. Looks more like G.wightii.
Is the above photo of the leaf taken by you, of the same tree from which you sold the seeds? Since G. mangostana is descended from G.malaccensis, the leaves of the seedling G.malaccensis, should look like the leaves of seedling G.mangostana, which are well rounded!!!