ROG Thor 850P Missing Cable

[AceKill26]

So I ordered this unit, and oddly enough when the package arrived the product wasn't sealed as seen on unboxing videos, so a few weeks later i realised the power cord was nowhere to be found in the box, does this fact depend on the region the psu is sold in? can a retailer just take out any power cord from any in stock power supply unit? if so do i have to use the power cord included in the box or can I just buy another one? I don't know what would be the difference since I didn't do proper research or looked into a psu power cord guide, so what would ve a recommended cable or specs of wich to be considered? Please I need an answer ASAP since it won't take long for all the parts to arrive!!!