Thanks for replaying. My source are some Norwegian books. The books are about people from the place Romslo in Hordaland Norway, where Konrad Johan left wife and two sons. I do not know about any letter, but I'm sure ther must have been at least some.
Konrad Johan never returned to Norway.
Your information about he was going to his uncle was new to me. I have found some information about his arrival in 1930.
I have just the New York Passenger Lists for April 30th 1930 with SS Bergensfjord.
My reason for this Query are helping a friensd with reaserching for a book about the Emigrations from this area Romslo. I'm doing this reaserch for free.
If you have more information about Konrad Johan don't hesitat to reply again.