Although your images show some yellow leaves, I think I spot healthy new green growth too? Maybe it is just a reaction to being transplanted (and/or being too dry during transport) and will sort itself out with proper care? Watering it should help and if it isn't already in slightly acidic soil, that will help too.
Good luck, I hope it makes it.
More on Louisiana Iris care:
https://www.gardeningknowhow.c...
