Jens C. Leich & Family/Passenger List

Thanks to the fantastic help I received with my earlier inquiries I have since been able to find a GREAT DEAL of information on the John Lake family who first settled in Wisconsin. What I have not had luck with is finding when/where/and on what ship they departed from in Norway. The 1865 Norwegian census shows Jens C. Leich, his wife Kari and their children, Oline, Carl, Julius, Hendrik and Maurits. they lived in Gjovik at that time. I searched every passenger list on this site from 1865 to 1870 BEFORE I found naturalization papers for Jens C Leich (John Lake), when he first applied November 4, 1867 in Wisc. to be naturalized. I understand there are utflyttende (moving out) records but, despite reading the various research articles, I do not know how to access them. I would greatly appreciate help. Thank you!