Brown Fee Waiver Policy?

I am interested in attending Brown ED, and I contacted their admissions office. They said that the fee waiver (in physical letter form) should be sent to them 14 days before November 1. I literally just decided to try applying to Brown, and it’s 10-11 days until Nov. 1. Is it too late to send it? Can my counselor send the explanation via email? Finally, is a letter or that NACAC fee waiver form better?

tha’s for the graduate school