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I would have made an appointment to meet them at the field office or a Dunkins.   Less chance of courtesy notice to the local PD.

And, if they are de-milled prior to meeting you, they will not have proof you possessed an illegal item (de-milled are no longer NFA items) and there is less danger one of these high-killey devices will escape into the street, but above all, do not lie to the feds.  The de-milled lump will meet the ATF requirement of recovering the items.