Regulations Governing Rewards for Reporting Violations of the Immigration Act Article 8

When a report is made jointly by more than one person, the reward shall be apportioned to them equally.When a report is made successively by more than one person, the reward shall be issued to the first reporter; when a report is made separately by more than one person and the sequence of reporting cannot be discerned, the reward shall be apportioned to them equally.
中文原文 舉發違反入出國及移民法事件獎勵辦法第8條
數人共同舉發者,其獎金平均分配。
數人先後舉發者,其獎金給與最先舉發者;數人分別舉發而無法辨明舉發時間先後者,其獎金平均分配。

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