Im curious to know why you believe this damage happened prior to you unboxing the case and building your PC? And why did you even build the PC if it was all messed up like you claim? I would have sent it back the day I received it. The fact that you didn't, and continued to build the PC is evidence enough for me to conclude that you scratched the case yourself and now want Phanteks to pay for it.
Car wax doesn't hide scratches. It's designed to protect the paint and give it an appealing shine. Plain and simple.I wonder if car wax would hide those very light scratch marks?
There are even colored car waxes available for this kind of rub marks.
If you wanted to remove those mild scratches, its possible to use some automotive polishing or cutting compound to buff out the scratch. Keep in mind though, these cases have FAR thinner paint than a car and 95% of cars have a thick protective clear coat on top of the paint. Using too harsh of a compound will likely cause you to polish right through the paint and exposing the underlying metal. buff it out using a microfiber cloth that is brand new, not one that has been through the laundry. The reason being that microfiber should always be washed in cool water and never dried in a warm/hot dryer. it ruins the fabric and will scratch delicate surfaces.