Thank you all for your answers
I already purchased some seeds in the past from different sources including RPS and Vivero Anones (BTW a very good one, sending really fresh seedsĦĦ) and some sprouted while other didn't.
I just realized there were not many posts regarding germination of these rare Musas, and I could not found a single plant of these Musas for sale in the net.
So I think very few of them sprouted and after reading your mails I am getting more convinced
Bananimal,
I am partially agree with your theory. After two year, I usually throw the non sprouted seeds, but I re-use the substrate for other plants. Two unexpected Musas grown outdoor in my garden, beside the planted plants. Just a problem.... no idea which ones
I will have to wait until they grow and flower... I will then post some pictures here asking for help