Chunghwa Post Co., Ltd. Establishment Act Article 13

If employees for whom regulations governing civil servants no longer apply in accordance with paragraph 2 or paragraph 3 of the preceding article lose benefits due to the shift of coverage from civil servant insurance to labor insurance, they are eligible for compensation calculated according to the old-age benefit calculation standards under the provisions of Article 14 of the Civil Servants Insurance Act. If, in accordance with the law, they are later covered by civil servant insurance, they shall return the aforesaid compensation to the Company when they receive their old-age benefits.
中文原文 中華郵政股份有限公司設置條例第13條
依前條第二項或第三項改為不適用公務人員有關法令之人員,因改投勞工保險致損失公教人員保險原有權益時,準用公教人員保險法第十四條規定之養老給付計算標準發給補償金。
但依法再參加公教人員保險領取養老給付時,應將補償金繳回本公司。

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