NIW RFE question

I have a NIW RFE requesting grant application documents I have been involved, including the pages identifying the research participants and roles.

I have a question in reponsing to it: How I can show the evidence of my roles in the projects if the application documents did not write my name while I really am a key member in the research?

Is it ok that I ask the boss to write a letter to say I am a key member?

Thanks.