After 17 days, I had the following results...
1 out of 12 Probosidea seeds germinated.
2 out of 7 Ibicella seeds germinated.
I noticed that there seemed to be a 2nd inner seed coat (thin and translucent compared to the hard outer black/white seed coat).
So I scrapped part of it off the rest of the Ibicella seeds and they all germinated in next 2 days!
Today, I peeled part of the seed coat off the Probosidea seeds.