Technically, anything you bought from an FFL as the original buyer should be treated as such. When any gun store goes out of business, they have to turn over all records and their log book of all sales. Dealers must retain records for 20yrs, but most don't destroy them at that mark. When ffls eventually close up shop, or if they have too much attention brought to them, these records are collected by NICS, who illegally makes scannable microfilm of the 4473s and log books. The microfilm is seen as a loophole against the GCA 68 registry prohibition (how this wasn't shutv down, I don't know) TLDR, any gun purchased from a store should be treated as registered. If you do any Internet searches on gun registration or hear about the FBI retaining records, this is how they are doing it. Fun fact, they jumped the gun on their illegal registry around 2010-2013. They got caught creating a literal digital database in direct violation of GCA 1968 and got caught in the state of CA. They were forced by court order to delete and destroy all records prior to that date except handgun purchases.