Originally Posted by Markbananas
No way to know if they are Musa Basjoo without seeing the bloom / flower
the musa basjoo foliage, there are some subtle differences in petioles, leaf color, etc. but those can be difficult to confirm. The foliage also tends to be a little lighter green than most other bananas, but so many variables (light exposure, nutrition, etc.) can impact the reliability of that.
You can find answers to questions you may have about banana plants or agriculture from experts. https://ask.extension.org/ask
This is not true. Musa basjoo is very easy to ID before flowering. The distinct large wavy winged petiole is a rather unique trait among all bananas, others have it too, but none are as common as M. basjoo, especially in the US. In addition, other bananas with similar distinct winged petioles have other drastically different traits too, none of which appear on your plants, that is aside from the fact it would be nearly impossible to accidentally receive those rare and unusual bananas compared to M. basjoo which is extremely common.
You can ask general plant or agriculture experts that likely do not know much or anything about bananas, or you can ask and believe the experts here.