Ink credit changed after comparing to art signed Toth & Peppe in issue 3. Gene Reed - 12/4/2010.
Page 6 appears to be inked by John Celardo. Also Busters face retouched on page 6 panel 2 and the last panel on page 9.
The lost city may be Mbebi (aka Ntoh Firloo), the original palace built for the Fon when the Nso people migrated from the Lake Chad area (in what, at the time of the story, was British Cameroons). The island the convicts escaped might be Fernando Po Island.