Im happy you saved all the Paperwork from that Sale, and because of that all will work out in your favor.
5 years ago I sold an Ruger P85 .9mm to a guy, and he too had all the proper ID. About 18 months after that sale I was Contacted by the FBI My ruger was used in a Homocide in Germany ??? How could my ole Ruger end up way over there.
Anyways they checked all my Paperwork should me some pictures
Had a meeting with ATF, and in the end I was all Clear neither the FBI,or The ATF gave me any details of the Homicide just that it occured.
Till this day I get an wierd feeling from time to time knowing my Weapon was used in a Homocide in Eastern Germany