MileHi is exactly right. The answers are all zero. Agents actually have to come to the gun shops and read the records to get a place to start. The 4473 records produce nothing directly but they do help with tracing guns that might get misused.
As a point of interest up thru the late 70’s dealers were required to keep a log book of handgun ammo purchases. Not once, not ever, were those records used to track anything so the requirement for the log was finally dropped. Same is true for 4473’s. They are useless on the prevention side.
Since NICS there is no longer any reason for 4473 forms, if there ever was. And the NICS has no legitimate to record firearm type or serial numbers. Just NI Check S the buyer and if he good what does it matter what he/she is buying?