WHAT MAKES THESE CULO CAMICIA'S RARE?

OUR BOXER SHORTS ARE ALREADY AS RARE AS THEY CAN COME AS THERE IS NO REPEATED PATTERN.
EACH SHIRT IS DIFFERENT, MEANING THAT EACH BOXER IS UNIQUE.
 
WHAT MAKES THIS BAD BOYS EVEN RARER IS THERE VERY HARD TO FIND PATTERN, MATERIAL (LINEN, SILK AND OTHERS) OR BRAND.