I got my C&R in 1999. In April of 2002 I received a call from my local BATF office saying they would like to meet with me at my convenience. I gave them a date and time and a very polite officer showed up at my door on time. He said he was there to answer any questions I had and to go over procedure in the wake of 9/11/01. I offered to show him my book, he declined, he answered all my questions and outlined the approved procedures for acquisition and disposition.
He was there about 20 minutes and left me his card, I have contacted him a few times over the years to get answers to questions.
He was from the NYC Field Office.