I have never been checked by BATF but my local "head of law enforcement" has been out three times in six years. He is a real busy body, pain in the neck. I suspect his real purpose is to try to get me to drop the C&R that his predecessor approved. His tone has been a subtle why do you need this C&R and why do you have so many guns? Since my next door neighbor is the Mayor, and he likes my collection, that is as far as it goes.
I think that the local guy is going farther than he should to check on my records and collection. I have shown him my book and he has seen a portion of my accumulation. Still I think that the less he knows or sees the less of a pain in the butt he will be.