Hello nep12341
Thank you for posting your query on HP Support Forum
If I am not wrong there is no Build ID and Feature Bytes for HP Pro 6005 Desktop PC.
The Feature Bytes and Build ID started from HP Pro 6200 Desktop PC onwards.
You can check by searching the serial number in part surfer link:
http://partsurfer.hp.com/search.aspx
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Thank You,
K B T 86
Although I am an HP employee, I am speaking for myself and not for HP