For the Computers, there is a newer V2 API api/sam/v2/computers. The Server ID is in a different API resource computer_hardware.
The BFI APIs provide an option to associate (join) different API resources to get different data sets.
Here is an example query to combine computers and computer_hardware resources to get the Server ID information. Replace SeverID:PORT with your BFI info to test the API from a browser, after logging in.
You need to be logged into the BFI UI and then open a new tab to run the query from the browser. The query should be https://Server:PORT/api/sam/v2/computers
I didn’t realize the APIs you had mentioned are for the platform and not for BFI. The ServerID information is obtained by the BFI HW scanner and will be available in BFI database