Sorry I went for a kip.
It really sounds like you are trying to rescue yourself, or justify your High IT expert wage, by making the problem seem more complex than it actually is.
In what way is an automobile comparable with a March Audio Amplifier?
Last time I checked high cost audio equipment does not get its labels rubbed off either within the warranty period or after it is sold on so that's the death of one of your other straw men unless the product gets stolen and someone takes out its VIN(s) with an angle grinder.
What's that... Two buffer boards. Two Amplifier Boards and perhaps Two PSU's, possibly one. Those are your major high value components. I guess they will come with manufacturer serial numbers. SHA256 them together and you have a label for the box for the things that matter.
I do apologize for coming up with an IT adjacent solution to your problem.
Elsewhere I am
years old and would have been the person who gave you the production data from the test equipment I designed and installed running against XT clones under TurboPascal to lose in your dirtybase. No the manufacturing company did not make cars but they banged out more product per day than we are talking about here.
I appear to have tooted.
It really sounds like you are trying to rescue yourself, or justify your High IT expert wage, by making the problem seem more complex than it actually is.