To yogibooboo
The reason why Lubavitch doesnt shave is because they pasken like the tzemach tzedek who holds that it is assur min hatorah to shave due to the issur of Lo Silbash. So even if we would know where the five corners were it would still be assur. This is besides for the kabbalisitic reasons that all the brachos are drawn down through the beard, and it represents the 13 middos harachamim.