cosmetics box
匳 centers on a container for small personal items, specifically a cosmetics box. The meaning is narrow and concrete, referring to a lidded box used for storing makeup or toiletries.
匳 combines the enclosure 匚 (box) with 僉, which likely contributes the sound. The character is a phono-semantic compound for a type of box, specifically a cosmetics box.
The outer 匚 is a box, and inside is 僉, which looks like a collection of small items. Picture a box filled with little compartments and tiny cosmetic tools.
For レン, imagine a cosmetics box shaped like a lens case: lens -> レン, and the box holds your beauty lenses.