That's correct, which is why the same laws that say you can't just take someone else's computer and do whatever you want with it apply within a company just the same. On a company laptop, you do not have the right to do anything on it without permission from the company.

These are the same laws that also allow surveillance cameras not only within company properties, but even in public.

You do not have the right to privacy when you are not in a private space. This applies to company computers just the same.