What happened to Øysten Nilsen Mhyre

I am looking for any suggestions on locating additional information on Øystein Nielsen Myhre known in America with given names of Osten & Austin and surnames of Myre, Nelson, Nelsontro & Troe. Here is what I have so far: 1) born 16 Mar 1848, Vang, father Niels Jørgenson mother Berthe Øysteinsdtr and baptized 14 May 1848 http://www.arkivverket.no/URN:kb_read?urnread_imagesize=gigant&info=ingen&hode=nei&show=14&uid=127964&js=j #34 2) in the 1865 Norway census he is listed as “is often away” 3) emigrated to America 1867 on the ship Nordcap, Quebec 9 Jun 1867 as Østen Nielsen Myhre. I have not been able to determine where he went though his brother was living in Silver lake Twp, Worth County, IA. 4) nothing until 19 Apr 1877 notice in the Albert Lea County Standard that he has uncollected mail at the post office (Myre, Osten Nelson) 5) birth of his 1st child Nels on 19 May 1877 Pickerel Lake Twp, Freeborn County, MN (parents are recorded as Osten & Mary Nelsontro – his brother, and my gggrandfather Nils Nilsen Myhre adopted the Troe surname around 1875). I have no idea who Mary is though one Family Tree at Ancestry.com shows her as Mary Segrie and the 1880 census says she was born in Norway about 1851. 6) “Certificate of Entry” recorded 17 Dec 1879 Brookings Twp, Brookings County SD. 7) 1880 Federal Census Entry Austin M Troe, wife Mary Troe, sons Nels & Knut, Brookings SD 8) Homestead Patent 30 Mar 1881 Brookings Twp, Brookings County SD 9) Sale of land 21 Nov 1882 Brookings Twp, Brookings County SD 10) 1895 his brother Nils in Worth County IA has organized a relief fund for South Dakota 11) 1895 the children are living with various uncles in Worth County, IA. 2 are listed as receiving “Orphan Support” from the county. That’s all I have been able to find despite inquiries to various people and organizations in Iowa, Minnesota & South Dakota. If anyone has any information or suggestions on where I might look for additional information I would be very grateful.