You aren't going to match the serial number, so how close do you need to get?
I have Kimbers, Sigs, and an HVAC Freon leak detector that all came in the exact same cases. So Kimber is just using something commonly available to manufacturers. I can find no identifying marks on them except the labels put on by the gun or tool maker, except there is a small embossed "Made in USA" on the inside bottom.