while your waiting might as well get your letters adressed and ready for the mail, heres a copy of what I sent to them with my FFL
Enclosed please find a signed copy of my Type 03, Curio and Relics, Federal Firearms License. Please keep this on file so that we may do business in the future. Also,if you would send me a copy of your latest catalogue or sales flyer and offer me any discounts that you may offer and place me on the mailing list for same, I would be most appreciative. Thank You in Advance.
then signed it with full name and address and e-mail address and phone number.