Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 47115 Brick Special 24 x 24 without 12 x 12 Quarter Circle, with Peg at each Corner this part is a alternate of it
• 42484 Brick Round Corner 12 x 12 with 3 Missing Bottom Tubes this part is a pair of it
• 6162 Brick Round Corner 12 x 12 this part is a pair of it