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.

• 2384 Light Sign 2 x 2 Clip on Back [Plain] this part is a print of it
• 2383 Light Cabinet 2 x 2 with Lamp Holes, 1 x 2 x 1 2/3 (Sign Back) Pair of this part