How2 find hardware serial numbers

The web is full of sites on how to find the serial number of your computer but not all serial numbers of hardware belonging to it.
I also found 'Hardware ID Extractor.exe' which is extremely limited and both Belarc Advisor and Speccy do not provide such info.
I was wondering if there is such info. Obviously this assumes the info is attached/embedded somehow on the hardware itself which may not be the case.
I have recently purchased an audio card. In wanting to register it the serial number on the box has a sticker with another number on it. I called Asus and asked them which of the 2 it may be. They said to not trust the sticker on the box and to look at the actual card. Makes sense to me except the card is already in my PC and every time I open it, it is hell--too much stuff in there and a slight movement of some wire or other creates havoc. Hence me asking this question.
Thank you

I use SIW (a free application). It details device serial numbers as well as a great deal of information about the computer


SIW | System Information for Windows by Gabriel Topala




No problems have occurred in my PC's using this software since I began using it a number of years ago.