Telemark to Boston 1881-lost family

Hello, I am new on this forum, so I apologize if I ask the wrong things. Here is my dilema. My family, the Ole K Traaen, left Fladal, Telemark, Norway in about 1881. they arrived in the port of Boston about December of that year. Those ship records were burned in a fire. Is there any way I can find the records of them leaving Norway? The only info I have that gives me the Dec 1881 date, is Ole's brother Halvor, made a statement written in the Yellow Medicine Co. Minnesota records, that claimed he arrrived at this time in Boston. As these brothers seemed to live and move together, I am assuming that Ole K Traaen, Halvor Traaen and Kittil Traaen, all came the same time. Ole had a wife, Guro Jacobsd. Huse and 2 daughters, Ingeborg and Julia or Margit. Any feedback would be appreciated. Just toady, I found that I could ask Mass. archives, for any records that they have, and they may be limited, but anything is more than nothing!!!! Thanks Kay Neubauer [email hidden] kay neubauer