BATFE has required the records of closed FFL since 1969, and stored them as well, in "as is" condition.
No one planned far enough in advance what to do with paper records in storage for more than a decade.
In addition, FFL have closed due to fires and floods--those records were turned in as well.
For "records preservation" BATFE started scanning in the pallets of Bound Books in their possession. Now, the instructions say to fill in information "legibly"--a term that is hard to exactly define.
So, some portion of those records will be "squiggle" of "hen scratch" bought "smudge"--it's not magic.
They only have 4473, and no other records.
No, no "database investigation." It's a listing that could be stuck in Excell as it's a simple 2d listing (at around 8-11 million records, it would strain Excell). From memory, it's a DB III file using a COBOL based SQL query. All portions of those records are Public Information.
The only reason to restrict access to that information is federal bureaucrat staff job protection (and to prevent public outcry over the quality and completeness of the records).
Which are up to fifty years old , now, and only record the first sale.
If actual criminal history were reviewed, then, perhaps, there might be some merit. It's only just a check against a list. But, you cannot look up criminal history in under 4-5 days.