round basket
筥 centers on a round basket, typically made of bamboo or similar material, used for holding or carrying items.
筥 combines 竹 (bamboo) with 吕, which likely contributes a phonetic element. The character originally referred to a round bamboo basket.
The top 竹 is bamboo, and the bottom 吕 looks like two round containers stacked. Picture a round basket woven from bamboo strips.
For キョ, imagine a round basket so big it could hold a giant key: key -> キョ, and the basket is woven from bamboo.