Great letter:

Destroying jade: a metaphor for the heavy losses caused by the dereliction of duty of the supervisor.

The hidden beads in the coffin: treasure. Raft: wooden box. The jewels are hidden in wooden boxes, waiting to be sold at high prices. It is a metaphor for talented people to stand by and retire.

Hiding: In the past, this was a metaphor for retired talents.

Return the pearl to buy Jane: metaphor has no vision and improper choice. It's the same as "buying gifts and returning pearls".

Giant letter: refers to a rich collection of books.

Tortoise and Jade Destroyed: Tortoise shell and Baoyu were destroyed in the box. Metaphor minister dereliction of duty, ruin the country's luck.

Buy bamboo slips and return pearls: bamboo slips: wooden cases; Pearl: Pearl. Bought a business box and returned the pearls. Metaphor has no vision and improper choice.