I see all sides of this picture: Retired 30Yr LE, FFL Holder, and citizen.
First I discourage a customer from ordering multiple handguns. I am
not a stocking dealer. If I receive more than one hand gun, I tell the customer
that I have to fill out the multiple hand gun form for ATF, and there maybe
a chance they will receive a visit from them. THEY KNOW THIS IN ADVANCE.
As a citizen w/o any prior knowledge of a visit, and 3 LE showed up w/vests on,
I would feel coerced in complying to a request I wasn't familiar with.
The ATF visit is not out of the norm, but three officers, that may or may not be normal procedure.
As a LE officer, if you arrive at a destination and find you are under powered, it may be to late to save even yourself.
At the present phase of Government interference in people lives, most will recent authority
if the situation isn't handled properly.
Most people will willingly comply, if FIRST they understand the circumstances of WHY.
Your mileage may vary. LDS