The ATF regularly "audits" the shop I work at. Also multiple firearms sales in the same transaction require you fax the 4473 data directly to them. They know what you have, or at the least a good idea. The next step is to criminalize us in one way or another and make the confiscation of said items and your "detention" palatable to the masses of sheeple. Then the real fun begins. (gently folds my tin foil hat and stores it for the next time I need it, which these days seems to be frequently)