The jade was kept and got damaged inside its case.
Tips
culture
椟 is the box in the famous idiom 买椟还珠 — buying the casket and returning the pearl, mocking someone who values flashy packaging over what really matters.
Right is 卖, here a contracted phonetic that gives the dú reading rather than its modern 'sell' sound. The same element drives 读 (to read) and 犊 (calf).
