It wouldn't be the multiple handgun purchase at least not at the FBI/NICS level. I think TN is a state where you have a state background check backed up by NICS iirc. It has an acronym, starts with a "P" I think. That could have made a difference if TN uses that data, but I don't know about TN.
Anyway, dealers have to report multiple handguns sales, but that info isn't on the background check. It's a separate form we have to send by close of business (fax), but on the NICS check it's just whether it's a handgun/rifle purchase or both, no quantities are given, at least not on the e-check we use.
I've been away from the board with a massive schedule, but I want to post on a NSSF seminar I attended where a FBI rep was there explaining NICS. I got a new found appreciation for how tough their job is but also a real feel for why the system is flawed. It's not really their fault, they have to rely on the state criminal data to build their data, and the specific check requirements don't line up 1:1 with state laws or data. In some states they have to inquire if a "domestic conviction" was violent or not, it's not in their database, so they mark it delayed then have to inquire with the state agency in question.
The FBI lady there said they literally had a case where they contacted a local court house for a check on a conviction to get clarification of the charge and was told the older records were kept in a building in the back and it had a bee hive and they weren't going to go back and retrieve them. lol.
Anyway, I doubt it was the multi-handgun purchase, and since NICS records are supposed to be purged they wouldn't have a record of the prior check either so it shouldn't have been that.
I agree it's probably a confusion with someone else or another record that's hit the system for a person you could be confused with. Maybe that person was OK and then something hit the database and you got snared up with it.
Regardless, it shouldn't take a week unless the FBI told the dealer to hold it that long, which I haven't experienced. the law says if the FBI doesn't get back to the dealer in 3 business days you can sell it and I've never had a delay set longer than that. However we get very few declines overall.