The Ship Registration Law Article 17

In the event that an documentary proof of registration as to the right of the obligor is found lost, the obligor shall state the reason for the loss of the proof in the application form, and submit the same together with two copies of letter of guarantee.
中文原文 船舶登記法第17條
登記義務人之權利登記證明文件滅失時,應於申請書內敘明其事由,並由登記義務人,取具保證書二份,連同申請書一併附送。

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