OK here is some more detail of from the letter.(after reading it for about the 3rd time and trying to understand the requirement).

Now I think after reading again the following, that I only need to file anything if there is a foreign partner that has either ECGI or ECTI allocated to them. Since there really are no foreign partners, I don't have any that have either of those so there are no forms to file or tax due. I am thinking a letter saying so will probably cover it.