If a customer lies on Form 4473 regarding a question that would prohibit the transfer of a firearm to him or her, the licensee is not aware that it is a lie or that the purchaser is ineligible, and that ineligibility is not picked up by NICS, has the FFL violated any federal firearms laws or ATF regulations by completing the transfer if that lie or ineligibility is later discovered?

If a customer lies on Form 4473 regarding a question that would prohibit the transfer of a firearm to him or her, the licensee is not aware that it is a lie or that the purchaser is ineligible, and that ineligibility is not picked up by NICS, has the FFL violated any federal firearms laws or ATF regulations by completing the transfer if that lie or ineligibility is later discovered?

No.