Whatever the OS says about who pieced together the laptop can't really be trusted. This is just some data read from a single file stored on your hard drive. Maybe two if it also has a manufacturer logo. Your laptop is most likely a HP Pavilion dv6875se. That number looks ugly though, which is why they call it a dv6700 for marketing purposes.

To be honest, it sounds like a pirated windows installation who's used some activation trick to make windows think it used a legit Dell OEM key. You should blackmail your boss for tons of money.

What sort of an upgrade is it your boss wants anyway? Anything more than a bit more RAM and/or a bigger hard drive is probably unfeasible. You could however figure out what kind of a HDD and RAM it requires without having to resort to the model number. There exists diagnostics software that can figure out what kind of hard drive interface and type of RAM a computer uses.