I just sold 250 yuzu seeds to a guy on feebay for $95!!! Are they polyembryonic?

I grew some last year, and it seems to be monoembryonic as I have seen only one embryo per seed. I only grew 6 seedlings, so is not a valid statistical sample. Unfortunately those seedlings died, when the emitters fell off the pot when we were on vacation. Will try again next year. I have loads of Yuzu fruits, enough to make another batch of wine during the winter.
So I will have seeds and will try to disect them and see if there are other embryos. I'll go the direct route of determining if they are mono or poly.

They are monoembryonic, but are supposed to come true. One of the rare exceptions.