National Palace Museum Regulations for the Acquisition of Cultural Relics Article 11

The Museum may accept donations of cultural relics. Donated cultural relics shall further be classified into the three categories of “first class gift,” “second class gift,” and “research material” based on their respective quality, manufacture dates, conditions, cultural and historical significance.
中文原文 國立故宮博物院藏品徵集辦法第11條
本院得接受文物之捐贈。
捐贈之文物依其品質、年代、完整度、歷史文化價值等區分為國贈、普贈及研究品三種級別。

English translation for reference only; the Chinese text prevails. Not legal advice.