Helena 1850 passenger list

I folund my great uncle (Christoffer Amundsen) and his family, as well as my great grandfather's future wife Anne Mathea Thorsdatter and her family; but I did not locate my grandfather Amund Amundsen, who, per records (naturalization), arrived New York in August 1850. I have found on the transcribed passngr list of the 1849 Superb an Amund Amundsen Braekke ( farm in Stokke not too far from his birthplace in Lardal and the age is correct). But I find it hard to believe he wouldn't have accompanied his brother and fiance. Questions: did they have stowaways!!?? Is the scan of the passenger list available and is the list complete? Is the transcript of the ship Thomas done or scan available? Thx for any ideas/help...Butch Amundson