3.) BIOS protected notes
Solution: Replace the BIOS...if the person can manage to do that in the first place.
Talking about those BIOS tweaks, company of my friend is using method to secure their data (and the computers maybe) by recoding Flash-BIOS. So as I remember, they encrypted the data on HD or only the first sectors, and by the password protection user could use the data and computer.

Replacing BIOS would let the thief to bypass password protection but the HD would be unusable (until reformat)..