Police say a further four possible male victims have made contact with them following the arrest of Kaitaia backpacker lodge owner Michael Harris.
Detective Senior Sergeant Rhys Johnston said the German nationals had been in touch overnight.
"Some just wanted information, but one was a concerned person who was most definately a victim," he said.
"The majority of victims are overseas tourists still travelling."
Alleged victims from around the world, including Germany, Scotland, the United Kingdom and the United States, have come forward.