Who can briefly explain the meaning of these two ancient Chinese prose "Carving a boat for a sword" and "Buying bamboo slips and returning pearls"

A man in the state of Chu crossed the river, and his sword fell from the boat into the water. He quickly marked the place where his sword fell with a knife beside the boat and said, "This is where my sword fell." The ship stopped at the destination, and the Chu people jumped into the water from the marked place to look for the sword. The ship has set sail, but the sword hasn't left yet. Isn't it silly to find a sword like this?

Metaphor is not to understand the development and changes of things, but to look at problems statically.

There was a jeweler in the state of Chu who went to Zheng to sell jewelry. (He) made (a) box (for jewelry) out of magnolia wood, smoked with spices made of cinnamon and pepper, decorated with beautiful jade, and connected with kingfisher feathers. A Zheng bought a box, but returned the beads in the box to the Chu people. This man can be said to be good at selling boxes, but not good at selling beads.

The original intention is to buy jewelry, leaving only beautiful boxes, which have no real high-value jewelry. Often used as a metaphor for lack of foresight and improper choice.