Losing the bill of sale, however, does present a potential problem, especially if you sold a firearm to a stranger and don't remember that person's name or address. If that firearm is ever used in a crime, you might one day receive a visit from a LEO and you might have to spend some "quality" time down at the police station until they're satisfied you weren't really involved with that crime.
My own opinion is that the bill of sale is an essential protection for the seller in the event of a private sale of a firearm, and should be kept and preserved in the same way you protect all of your other important papers.
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