CVaper said:
I buy a gun from you, but dont give you any paperwork.
The gun turns up missing from my safe
The gun is used to shoot someone and is recovered as evidence, but no suspect.
Tracking goes to the last know person and that person is primary suspect. Paperwork is a form of CYA. even if it is a simple piece of paper saying Joe Blow has your gun
Several problems with your scenario.
1) The bill of sale is not "official documentation" (i.e. you're not a regulated entity, licensed entity, nor is the paperwork notarized and "true") The "documentation" you are using to "cover your ass" will have exactly the same weight in court as the words that come out of your mouth.
2) Simply having owned a gun (or car, et al.) at one point in time will not implicate you in any crime. Worst case scenario is you will be asked if you remember any information of who you sold the gun to and then never talked to again, irregardless if you say "I don't remember" or "Here is a photocopy of his drivers license, a sample of his DNA and an X-ray of his teeth." Same result.
The thesis of the above is to assuage any "well, it's better to err on the side of caution!" nonsense. If you want to generate paperwork, and the guy buying/selling agrees to it, then so be it. But don't have a fantasy that this worthless paperwork will do anything to shield you from malicious prosecution in the future.