here is one way in how they trace guns ...
They find a gun, it has a serial #
They call the manufacturer and find the distributor that they sold it to
They call the distributor and find the dealer it was sold to
They call the dealer and find out who the dealer sold it to (that's you) [if dealer out of business, then they check the ATF files for the dealer who sent in his books and ATF forms - forms sometimes kept forever, sometimes only a specific time period- depends on dealer]
They call you can find out if your sold it (if you want to tell them of course) & who you sold it to
So if you wish to get yourself disassociated from the gun...well, you can't (unless someone along the line lost their paperwork, which is not likely).
You can write DPS and ask for the records under a records request:
These records are likely not available under the FOI Act ...
but when requesting the records you can cite both as grounds for producing the records to you