Firearms do not kill people, other people do.
I understand what you are saying. Have known about homes where murders took place and a lot of people would not consider buying them much less living in them after the events that took place.
Is that logical? No.
But that does not make it easier to overcome the connection to past violence? No.
And please dont misunderstand. I am concerned about the law enforcement communitys reaction to the previous uses of the gun, as opposed to some nefarious aspect of the firearm itself.
In other words - the firearm is a chunck of metal. It is neither good nor evil.
But the manner in which it was used in the past can be used by some people, particularly in law enforcement, to harass the new legal owner if the sale by the city doesn't erect enough of a firewall between previous use and new management. It is the people in the equation that worry me, not the weapon.
I could see the anticonstitutional eneMedia blaring “Murder Weapon Found in Home of Texas Fossil!” Even though the crime was committed years years ago.
Here's another issue; it's different but interesting. A Freeper posted that he was picked up by the police because they traced a gun he owned to a murder. He had reported it stolen. Fortunately, he made bail and found the report. We have to be on guard against a hostile press and incompetent police.