There is a chart of L'ile Dagelet (The Isle of Dagelet) in the sheet of charts and the French note says that "Discovered by the French frigates la Boussole and l'Astrolabe. The 27th May 1787. " with the exact location of the island. [Click the map to enlarge]
Another four charts depicted other islands - "a part of the isle of Quelpaert (Chejudo)", "the isle of Hoapinsu", "a part of the isle of Botol", and "the isle of Kumi". All of these islands were only "vue" (that means "seen"), not discovered. The dates depicted in these charts may illustrate how the French frigates navigated - they saw a part of the isle of Botol on 3rd May 1787, then the isle of Kumi on 5th May, the isle of Hoapinsu on 7th May, a part of the isle of Qeulpaert on 21st May and lastly they discovered Dagelet on 27th May.