The Klein's official record of serial (and control) numbers, if the law dropped by, would be the "master book".
Guess what Einstein, the law did drop by and Kleins readily retrieved all the relevant paperwork! LOL!
Kleins traced where they received the rifle from.
Kleins traced their catalogue number.
Kleins traced who bought the rifle
Kleins traced where they sent the rifle.
Kleins business records as required by law allowed them to successfully achieve these results.
Btw keep trying because watching you dig a deeper hole with every post amuses me.
JohnM