What are the steps to validate the collected BIOS Serial Number is proper or not for target machines?

Discovery, Inventory and Compliance General
1

Please check steps below -
Windows :

  • Open the command prompt and run the command
  • WMIC BIOS GET SERIALNUMBER
    This will give the serial number and match against the SapphireIMS collected data.

Linux:
Open the terminal application and type the following command as root or sudo user. Prefix sudo is required only if credential is sudo and not the root user.
dmidecode -s system-serial- number .

MAC:
To start, head to the ‘Apple’ menu icon in the upper-left corner of your ‘MacBook’ .
Click on it and select ‘About this Mac’ .” Your serial number will appear on the very next screen, likely as the last line on the screen.

2

On Windows, the WMI command-line (WMIC) utility is deprecated as of Windows 10, version 21H1, and as of the 21H1 semi-annual channel release of Windows Server. This utility is superseded by Windows PowerShell for WMI (see [Chapter 7—Working with WMI] (Working with WMI - PowerShell | Microsoft Learn))

It still seems to be working on Windows 11 though…

3

Indeed, the wmic command utility is being deprecated, meaning that it will no longer be further developed or updated, but still it will be working as long as the underlying system will continue to support it. The WMI command-line (WMIC) utility is deprecated as of Windows 10, version 21H1, and as of the 21H1 semi-annual channel release of Windows Server.

Starting with Windows 11 build 22572 -, WMIC is now available as an optional feature that can be uninstalled or reinstalled via [Settings > Apps > Optional Features]